AIRWORTHINESS DIRECTIVE
CAA-AD-049/2001
Date of issue:
June 07, 2001
AIRCRAFT - CHEMICAL OXYGEN GENERATOR - INSPECTION
Applicability: Model 737, 747, 757, 767, and 777 series
airplanes equipped with chemical oxygen generators, certificated in any
category; as listed in the following Boeing Special Attention Service Bulletins,
as applicable:
Table 1. - Service Bulletins
|
Service bulletin |
Date |
Model |
|
737-35-1076 |
March 1, 2001 |
737 |
|
737-35-1077 |
March 1, 2001 |
737 |
|
747-35-2111 |
March 1, 2001 |
747 |
|
757-35-0021 |
March 1, 2001 |
757 |
|
757-35-0022 |
March 1, 2001 |
757 |
|
767-35-0043 |
March 1, 2001 |
767 |
|
767-35-0044 |
March 1, 2001 |
767 |
|
777-35-0008 |
March 1, 2001 |
777 |
Effective date: June 08, 2001
Compliance: Required as indicated in FAA AD 2001-10-14.
Remarks: The compliance of
this AD must be recorded in Aircraft Logbook, where applicable the requirements
of this AD must be integrated into Aircraft Technical Documentation. Address
inquiries concerning this AD to: Civil Aviation Authority, Airworthiness
Division, Ruzyne Airport, 160 08 Prague 6, Czech Republic, tel: 420 2 33320922,
fax: 420 2 20562270.
Ing. Pavel MATOUŠEK
Director of
Airworthiness Division
CAA CZ
2001-10-14
Boeing: Amendment
39-12240. Docket 2001-NM-81-AD.
Applicability: Model 737, 747, 757, 767, and 777 series airplanes
equipped with chemical oxygen generators, certificated in any category; as
listed in the following Boeing Special Attention Service Bulletins, as
applicable:
Table 1. - Service Bulletins
|
Service
bulletin |
Date |
Model |
|
737-35-1076 |
March 1, 2001 |
737 |
|
737-35-1077 |
March 1, 2001 |
737 |
|
747-35-2111 |
March 1, 2001 |
747 |
|
757-35-0021 |
March 1, 2001 |
757 |
|
757-35-0022 |
March 1, 2001 |
757 |
|
767-35-0043 |
March 1, 2001 |
767 |
|
767-35-0044 |
March 1, 2001 |
767 |
|
777-35-0008 |
March 1, 2001 |
777 |
Note 1: This AD applies to each airplane identified in the preceding
applicability provision, regardless of whether it has been modified, altered,
or repaired in the area subject to the requirements of this AD. For airplanes
that have been modified, altered, or repaired so that the performance of the
requirements of this AD is affected, the owner/operator must request approval
for an alternative method of compliance in accordance with paragraph (b) of
this AD. The request should include an assessment of the effect of the
modification, alteration, or repair on the unsafe condition addressed by this
AD; and, if the unsafe condition has not been eliminated, the request should
include specific proposed actions to address it.
Compliance: Required as indicated, unless accomplished previously.
To find and fix incorrect installation of the release pin in the generator
firing mechanism of the chemical oxygen generator, which could result in the
unavailability of supplemental oxygen and possible incapacitation of passengers
and cabin crew during an in-flight decompression; accomplish the following:
Detailed Visual Inspections
Note 2: For the purposes of this AD, a detailed visual inspection is
defined as: "An intensive visual examination of a specific structural
area, system, installation, or assembly to detect damage, failure, or
irregularity. Available lighting is normally supplemented with a direct source
of good lighting at intensity deemed appropriate by the inspector. Inspection
aids such as mirror, magnifying lenses, etc., may be used. Surface cleaning and
elaborate access procedures may be required."
(a) For airplanes having any chemical oxygen generator and/or passenger,
attendant, or lavatory service unit assembly that contains a chemical oxygen
generator that has been replaced: Within 90 days after the effective date of
this AD, do a detailed visual inspection of the chemical oxygen generator of
the applicable assembly to verify correct installation of the release pin in
the generator firing mechanism per the Accomplishment Instructions of the
applicable service bulletin listed in Table 2., below. Before further flight,
after replacement of any chemical oxygen generator and/or passenger, attendant
lavatory service unit assembly that contains a chemical oxygen generator,
repeat the detailed visual inspection.
Table 2. - Service Bulletins
|
Service
bulletin |
Date |
Model |
|
737-35-1076 |
March 1, 2001 |
737 |
|
737-35-1077 |
March 1, 2001 |
737 |
|
747-35-2111 |
March 1, 2001 |
747 |
|
757-35-0021 |
March 1, 2001 |
757 |
|
757-35-0022. |
March 1, 2001 |
757 |
|
767-35-0043 |
March 1, 2001 |
767 |
|
767-35-0044 |
March 1, 2001 |
767 |
|
777-35-0008 |
March 1, 2001 |
777 |
Corrective Action
(1) If no discrepancy (release pin in safety pin hole) is found after doing the
inspection required by paragraph (a) of this AD, no further action is required
until replacement of any existing chemical oxygen generator and/or passenger,
attendant, or lavatory service unit assembly that contains a chemical oxygen
generator.
(2) If any discrepancy is found after doing the inspection required by
paragraph (a) of this AD, before further flight, do the corrective action per
the applicable service bulletin listed in Table 2., above.
Note 3: The release pin and safety pin are located in the generator
firing mechanism. The safety pin hole is the hole in the generator firing
mechanism that is closest to the main body of the generator. The release pin
hole is the hole in the generator firing mechanism located furthest from the
main body of the generator. The center axis of the release pin hole is
perpendicular to the center axis of the safety pin hole.
Note 4: Inspections and corrective action done before the effective date
of this AD, per Boeing Telex M-7200-00-02474, dated October 9, 13, 19, or 31,
2000; or Boeing Telex M-7200-00-03040, dated December 18, 2000; are considered
acceptable for compliance with the initial inspection and corrective action
specified in paragraph (a) of this AD. However, prior accomplishment of the
inspections and corrective action specified in the telexes does not eliminate
the need for the repetitive inspections required by paragraph (a) of this AD.
Alternative Methods of Compliance
(b) An alternative method of compliance or adjustment of the compliance time
that provides an acceptable level of safety may be used if approved by the
Manager, Seattle Aircraft Certification Office (ACO), FAA. Operators shall
submit their requests through an appropriate FAA Principal Maintenance
Inspector, who may add comments and then send it to the Manager, Seattle ACO.
Note 5: Information concerning the existence of approved alternative
methods of compliance with this AD, if any, may be obtained from the Seattle
ACO.
Special Flight Permits
(c) Special flight permits may be issued in accordance with Secs. 21.197 and
21.199 of the Federal Aviation Regulations (14 CFR 21.197 and 21.199) to
operate the airplane to a location where the requirements of this AD can be
accomplished.
Incorporation by Reference
(d) The actions shall be done in accordance with the following Boeing Special
Attention Service Bulletins, as applicable:
Table 3.--Service Bulletins
|
Service
bulletin |
Date |
Model |
|
737-35-1076 |
March 1, 2001 |
737 |
|
737-35-1077 |
March 1, 2001 |
737 |
|
747-35-2111 |
March 1, 2001 |
747 |
|
757-35-0021 |
March 1, 2001 |
757 |
|
757-35-0022 |
March 1, 2001 |
757 |
|
767-35-0043 |
March 1, 2001 |
767 |
|
767-35-0044 |
March 1, 2001 |
767 |
|
777-35-0008 |
March 1, 2001 |
777 |
This incorporation by reference was approved by the Director of the Federal
Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be
obtained from Boeing Commercial Airplane Group, P.O. Box 3707, Seattle,
Washington 98124-2207. Copies may be inspected at the FAA, Transport Airplane
Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the Office of the
Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC.
Effective Date
(e) This amendment becomes effective on June 8, 2001.