BOEING707

ID: US-2017-18-20
Issue date: 2017-10-09
Effective date: 2017-11-09
Source: FAA
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Doors - Main Cargo Door Cam Support Assemblies - Inspection / Replacement

[Federal Register Volume 82, Number 192 (Thursday, October 5, 2017)]
[Rules and Regulations]
[Pages 46382-46385]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2017-19041]

––––––––––––––––––––––––––––––––––

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2016-9183; Product Identifier 2016-NM-059-AD; Amendment 39-19029; AD
2017-18-20]

RIN 2120-AA64

Airworthiness Directives; The Boeing Company Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

––––––––––––––––––––––––––––––––––

Summary:
We are adopting a new airworthiness directive (AD) for The Boeing Company Model
707 airplanes equipped with a main cargo door (MCD). This AD was prompted by analysis of the
cam support assemblies of the MCD that indicated the repetitive high frequency eddy current (HFEC)
inspections required by the existing maintenance program are not adequate to detect cracks before
two adjacent cam support assemblies of the MCD could fail. This AD requires repetitive ultrasonic
inspections for cracking of the cam support assemblies of the MCD, and replacement if necessary.
We are issuing this AD to address the unsafe condition on these products.

Dates:
This AD is effective November 9, 2017.
The Director of the Federal Register approved the incorporation by reference of a certain
publication listed in this AD as of November 9, 2017.

Addresses:
For service information identified in this final rule, contact Boeing Commercial
Airplanes, Attention: Contractual & Data Services (C&DS), 2600 Westminster Blvd., MC 110-SK57,
Seal Beach, CA 90740-5600; telephone 562-797-1717; Internet https://www.myboeingfleet.com.
You may view this service information at the FAA, Transport Standards Branch, 1601 Lind Avenue
SW., Renton, WA. For information on the availability of this material at the FAA, call 425-227-1221.
It is also available on the Internet at http://www.regulations.gov by searching for and locating Docket
No. FAA-2016-9183.

Examining the AD Docket

You may examine the AD docket on the Internet at http://www.regulations.gov by searching for
and locating Docket No. FAA-2016-9183; or in person at the Docket Management Facility between 9
a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD docket contains this final

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rule, the regulatory evaluation, any comments received, and other information. The address for the
Docket Office (phone: 800-647-5527) is Docket Management Facility, U.S. Department of
Transportation, Docket Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New
Jersey Avenue SE., Washington, DC 20590.

FOR FURTHER INFORMATION CONTACT: Chandra Ramdoss, Aerospace Engineer,
Airframe Section, FAA, Los Angeles ACO Branch, 3960 Paramount Boulevard, Lakewood, CA
90712-4137; phone: 562-627-5239; fax: 562-627-5210; email: chandraduth.ramdoss@faa.gov.

SUPPLEMENTARY INFORMATION:

Discussion

We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR part 39 by adding an AD
that would apply to all The Boeing Company Model 707 airplanes. The NPRM published in the
Federal Register on October 4, 2016 (81 FR 68376) (“the NPRM”). The NPRM was prompted by
analysis of the cam support assemblies of the MCD that indicated the repetitive HFEC inspections
required by the existing maintenance program are not adequate to detect cracks before two adjacent
cam support assemblies of the MCD could fail. The NPRM proposed to require repetitive ultrasonic
inspections for cracking of the cam support assemblies of the MCD, and replacement if necessary.
We are issuing this AD to detect and correct cracking of the cam support assemblies of the MCD.
Such cracking could result in reduced structural integrity of the MCD and consequent rapid
decompression of the airplane.

Comments

We gave the public the opportunity to participate in developing this final rule. The following
presents the comments received on the NPRM and the FAA's response to each comment.
Request To Revise Applicability
Boeing stated that Boeing 707 Alert Service Bulletin A3542, dated February 12, 2016, affects
only Boeing factory and Boeing-converted freighters, but the proposed AD extends the applicability
to all Model 707 airplanes, including the ones that have been converted by non-Boeing supplemental
type certificates (STCs).
We infer the commenter is requesting that the actions of the service information only be required
for Model 707 airplanes identified in the Effectivity paragraph of Boeing 707 Alert Service Bulletin
A3542, dated February 12, 2016. We agree that the applicability of the proposed AD should not
include Model 707 airplanes that do not have an MCD. However, we disagree that the AD
applicability should be limited to the airplanes identified in the Effectivity paragraph of Boeing 707
Alert Service Bulletin A3542, dated February 12, 2016, which only identifies Boeing factory and
Boeing-converted freighters. The cam support assemblies having the affected part number could be
installed at original aircraft manufacture, or during passenger-to-freighter modification. We expect
that the actions specified in Boeing 707 Alert Service Bulletin A3542, dated February 12, 2016, can
be accomplished on airplanes that are not identified in that service information. However, if an
operator with a Model 707 freighter that is not a part of Boeing type design cannot accomplish the
required actions in the service information, or prefers to use different service information that is
specific to their design, approval of an alternative method of compliance (AMOC) can be requested
in accordance with paragraph (j) of this AD. We revised this AD to limit the applicability to Model
707 airplanes equipped with an MCD.
Request To Supersede AD 80-08-10 R1, Amendment 39-3830 (45 FR 46343, July 10, 1980) (“AD
80-08-10 R1”)
Boeing requested that we revise the NPRM to supersede AD 80-08-10 R1. Boeing stated that AD
80-08-10 R1 mandates HFEC inspections of MCD cam support assemblies having part numbers

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(P/Ns) 69-23588-1 and 69-23588-2, as specified in Boeing Service Bulletin 707-A3387. Boeing
explained that the NPRM is adding cam support assemblies having P/Ns 69-23588-1 and 69-23588-2
to the list in Boeing 707 Alert Service Bulletin A3542, dated February 12, 2016. Boeing asserted that
the addition of these components to the list of affected parts would mean that the operators have to
perform HFEC inspections of cam support assemblies having P/Ns 69-23588-1 and 69-23588-2, as
specified in AD 80-08-10 R1, and perform ultrasonic inspections of the same components, as
specified in the proposed AD. Boeing explained that cracking initiates at the bottom of the lubrication
hole on the inside of the cam support fitting lug and is not visible until it breaks to the surface of the
lug. The subsurface detection capability of the ultrasonic inspection provides a more reliable
inspection.
We partially agree with Boeing's request to supersede the inspections which are still required per
AD 80-08-10 Rl. These inspections will overlap with the newly mandated repetitive inspections. We
disagree with the request to revise this AD to supersede AD 80-08-10 Rl. Instead, we have added
language to paragraph (i) of this AD to state that accomplishing the initial inspection and all
applicable replacements required by paragraph (h) of this AD on an airplane terminates the
requirements of AD 80-08-10 R1, for that airplane only.
Request To Revise Compliance Time
Boeing requested that we revise the compliance time in paragraph (g)(l) of the proposed AD
from “before the accumulation of 18,000 total flight cycles” to “before the accumulation of 18,000
door flight cycles, or within 10 years after the utilization of MCD cam support assemblies, whichever
occurs first. If the door flight cycles are not known, use total airplane flight cycles.” Boeing explained
that this change would provide relief for the operators that use converted freighters by delaying the
required inspection for the MCDs that have been in service less than 18,000 total door flight cycles,
but are installed on the airplanes that have more than 18,000 total airframe flight cycles. Boeing also
stated that the 10-year time limit is included in Boeing 707 Alert Service Bulletin A3542, dated
February 12, 2016, to address the low utilization rate of Model 707/720 airplanes.
We agree with Boeing's request. For the airplanes that have been converted to freighters, the
compliance time for the initial inspection should be based on the number of cycles the MCD cam
support assembly has been in service. We have revised paragraph (g)(l) of this AD accordingly. In
addition, we have revised paragraph (h) of this AD to refer to the compliance times specified in
paragraphs (g)(1) and (g)(2) of this AD instead of referring to Boeing 707 Alert Service Bulletin
A3542, dated February 12, 2016. We have also removed the exception to the service information that
was in paragraph (i) of the proposed AD.

Conclusion

We reviewed the relevant data, considered the comments received, and determined that air safety
and the public interest require adopting this final rule with the changes described previously and
minor editorial changes. We have determined that these minor changes:
• Are consistent with the intent that was proposed in the NPRM for correcting the unsafe
condition; and
• Do not add any additional burden upon the public than was already proposed in the NPRM.
We also determined that these changes will not increase the economic burden on any operator or
increase the scope of this final rule.

Related Service Information Under 1 CFR Part 51

We reviewed Boeing 707 Alert Service Bulletin A3542, dated February 12, 2016. The service
information describes procedures for an ultrasonic inspection of the cam support assemblies of the
MCD for cracking, and replacement if necessary. This service information is reasonably available
because the interested parties have access to it through their normal course of business or by the
means identified in the ADDRESSES section.
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Costs of Compliance

We estimate that this AD will affect 12 airplanes of U.S. registry. We estimate the following
costs to comply with this AD:

Estimated Costs
Action Labor cost Parts Cost per product Cost on U.S.
cost operators
Inspection 6 work-hours × $85 per hour = $510 $0 $510 per $22,950 per
per inspection cycle inspection cycle inspection cycle.

We estimate the following costs to do any necessary replacements that would be required based
on the results of the inspection. We have no way of determining the number of aircraft that might
need this replacement:

On-Condition Costs
Action Labor cost Parts cost Cost per product
Replacement 60 work-hours × $85 per hour = $5,100 $14,107 $19,207

Authority for This Rulemaking

Title 49 of the United States Code specifies the FAA's authority to issue rules on aviation safety.
Subtitle I, section 106, describes the authority of the FAA Administrator. Subtitle VII: Aviation
Programs, describes in more detail the scope of the Agency's authority.
We are issuing this rulemaking under the authority described in Subtitle VII, Part A, Subpart III,
Section 44701: “General requirements.” Under that section, Congress charges the FAA with
promoting safe flight of civil aircraft in air commerce by prescribing regulations for practices,
methods, and procedures the Administrator finds necessary for safety in air commerce. This
regulation is within the scope of that authority because it addresses an unsafe condition that is likely
to exist or develop on products identified in this rulemaking action.
This AD is issued in accordance with authority delegated by the Executive Director, Aircraft
Certification Service, as authorized by FAA Order 8000.51C. In accordance with that order, issuance
of ADs is normally a function of the Compliance and Airworthiness Division, but during this
transition period, the Executive Director has delegated the authority to issue ADs applicable to
transport category airplanes to the Director of the System Oversight Division.

Regulatory Findings

This AD will not have federalism implications under Executive Order 13132. This AD will not
have a substantial direct effect on the States, on the relationship between the national government and
the States, or on the distribution of power and responsibilities among the various levels of
government.
For the reasons discussed above, I certify that this AD:
(1) Is not a “significant regulatory action” under Executive Order 12866,
(2) Is not a “significant rule” under DOT Regulatory Policies and Procedures (44 FR 11034,
February 26, 1979),
(3) Will not affect intrastate aviation in Alaska, and


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(4) Will not have a significant economic impact, positive or negative, on a substantial number of
small entities under the criteria of the Regulatory Flexibility Act.

List of Subjects in 14 CFR Part 39

Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.

Adoption of the Amendment

Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR
part 39 as follows:

PART 39–AIRWORTHINESS DIRECTIVES

1. The authority citation for part 39 continues to read as follows:

Authority: 49 U.S.C. 106(g), 40113, 44701.

§ 39.13 [Amended]

2. The FAA amends § 39.13 by adding the following new airworthiness directive (AD):




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AIRWORTHINESS
FAA DIRECTIVE
Aviation Safety
www.faa.gov/aircraft/safety/alerts/
www.gpoaccess.gov/fr/advanced.html


2017-18-20 The Boeing Company: Amendment 39-19029; Docket No. FAA-2016-9183; Product
Identifier 2016-NM-059-AD.

(a) Effective Date

This AD is effective November 9, 2017.

(b) Affected ADs

This AD affects AD 80-08-10 R1, Amendment 39-3830 (45 FR 46343, July 10, 1980).

(c) Applicability

This AD applies to The Boeing Company Model 707-100 Long Body, -200, -100B Long Body,
and -100B Short Body series airplanes; and Model 707-300, -300B, -300C, and -400 series airplanes;
certificated in any category; equipped with a main cargo door (MCD).

(d) Subject

Air Transport Association (ATA) of America Code 52, Doors.

(e) Unsafe Condition

This AD was prompted by analysis of the cam support assemblies of the MCD that indicated the
repetitive high frequency eddy current (HFEC) inspections required by the existing maintenance
program are not adequate to detect cracks before two adjacent cam support assemblies of the MCD
could fail. We are issuing this AD to detect and correct cracking of the cam support assemblies of the
MCD. Such cracking could result in reduced structural integrity of the MCD and consequent rapid
decompression of the airplane.

(f) Compliance

Comply with this AD within the compliance times specified, unless already done.

(g) Inspection to Determine Part Numbers

At the later of the times specified in paragraphs (g)(1) and (g)(2) of this AD: Inspect the cam
support assemblies of the MCD to determine whether part number (P/N) 69-23588-1, 69-23588-2,
69-23588-5, 69-23588-6, 69-23588-9, or 69-23588-10 is installed. A review of airplane maintenance
records is acceptable in lieu of this inspection if the part number(s) of the cam support assemblies of
the MCD can be conclusively determined from that review.
(1) Before the accumulation of 18,000 total flight cycles since installation of the door, or before
the accumulation of 10 years on the MCD cam support assemblies, whichever occurs first. If the
number of flight cycles since installation of the door are not known, use total airplane flight cycles.

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(2) Within 1,790 flight cycles or 24 months after the effective date of this AD, whichever occurs
later.

(h) Repetitive Inspections of the Cam Support Assemblies of the MCD and Corrective Actions

If, during any inspection required by paragraph (g) of this AD, any cam support assembly of the
MCD having P/N 69-23588-1, 69-23588-2, 69-23588-5, 69-23588-6, 69-23588-9, or 69-23588-10 is
determined to be installed: At the later of the times specified in paragraphs (g)(1) and (g)(2) of this
AD, do an ultrasonic inspection to detect cracking of the affected cam support assemblies of the
MCD, and do all applicable replacements, in accordance with the Accomplishment Instructions of
Boeing 707 Alert Service Bulletin A3542, dated February 12, 2016. Do all applicable replacements
before further flight. Repeat the inspections thereafter at the applicable time specified in paragraph
1.E., “Compliance,” of Boeing 707 Alert Service Bulletin A3542, dated February 12, 2016.

(i) Terminating Action for AD 80-08-10 R1, Amendment 39-3830 (45 FR 46343, July 10, 1980)

Accomplishment of the initial inspection and all applicable replacements on an airplane, as
required by paragraph (h) of this AD, terminates all the requirements of AD 80-08-10 R1,
Amendment 39-3830 (45 FR 46343, July 10, 1980), for that airplane only.

(j) Alternative Methods of Compliance (AMOCs)

(1) The Manager, Los Angeles ACO Branch, FAA, has the authority to approve AMOCs for this
AD, if requested using the procedures found in 14 CFR 39.19. In accordance with 14 CFR 39.19,
send your request to your principal inspector or local Flight Standards District Office, as appropriate.
If sending information directly to the manager of the certification office, send it to the attention of the
person identified in paragraph (k) of this AD. Information may be emailed to: 9-ANM-LAACO-
AMOC-Requests@faa.gov.
(2) Before using any approved AMOC, notify your appropriate principal inspector, or lacking a
principal inspector, the manager of the local flight standards district office/certificate holding district
office.
(3) An AMOC that provides an acceptable level of safety may be used for any repair,
modification, or alteration required by this AD if it is approved by the Boeing Commercial Airplanes
Organization Designation Authorization (ODA) that has been authorized by the Manager, Los
Angeles ACO Branch, to make those findings. To be approved, the repair method, modification
deviation, or alteration deviation must meet the certification basis of the airplane, and the approval
must specifically refer to this AD.
(4) For service information that contains steps that are labeled as Required for Compliance (RC),
the provisions of paragraphs (j)(4)(i) and (j)(4)(ii) of this AD apply.
(i) The steps labeled as RC, including substeps under an RC step and any figures identified in an
RC step, must be done to comply with the AD. If a step or substep is labeled “RC Exempt,” then the
RC requirement is removed from that step or substep. An AMOC is required for any deviations to RC
steps, including substeps and identified figures.
(ii) Steps not labeled as RC may be deviated from using accepted methods in accordance with
the operator's maintenance or inspection program without obtaining approval of an AMOC, provided
the RC steps, including substeps and identified figures, can still be done as specified, and the airplane
can be put back in an airworthy condition.




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(k) Related Information

For more information about this AD, contact Chandra Ramdoss, Aerospace Engineer, Airframe
Section, FAA, Los Angeles ACO Branch, 3960 Paramount Boulevard, Lakewood, CA 90712-4137;
phone: 562-627-5239; fax: 562-627-5210; email: chandraduth.ramdoss@faa.gov.

(l) Material Incorporated by Reference

(1) The Director of the Federal Register approved the incorporation by reference (IBR) of the
service information listed in this paragraph under 5 U.S.C. 552(a) and 1 CFR part 51.
(2) You must use this service information as applicable to do the actions required by this AD,
unless the AD specifies otherwise.
(i) Boeing 707 Alert Service Bulletin A3542, dated February 12, 2016.
(ii) Reserved.
(3) For service information identified in this AD, contact Boeing Commercial Airplanes,
Attention: Contractual & Data Services (C&DS), 2600 Westminster Blvd., MC 110-SK57, Seal
Beach, CA 90740-5600; telephone 562-797-1717; Internet https://www.myboeingfleet.com.
(4) You may view this service information at the FAA, Transport Standards Branch, 1601 Lind
Avenue SW., Renton, WA. For information on the availability of this material at the FAA, call 425-
227-1221.
(5) You may view this service information that is incorporated by reference at the National
Archives and Records Administration (NARA). For information on the availability of this material at
NARA, call 202-741-6030, or go to: http://www.archives.gov/federal-register/cfr/ibr-locations.html.

Issued in Renton, Washington, on August 31, 2017.
Dionne Palermo,
Acting Director, System Oversight Division,
Aircraft Certification Service.




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This is a partial extract of the full document - please refer to the actual report for full information.
Sources as credited.