AIRWORTHINESS DIRECTIVE
CAA-AD-056/2001
Date of issue:
June 18, 2001
AIRCRAFT - HYDRAULIC SHUTOFF VALVES - INSPECTION
Applicability: Model 737, 757, and 767 series airplanes, certificated in any category, as listed in the following Boeing Service Bulletins:
Table
1. Effectivity.
|
Boeing Service Bulletin |
Date |
Affected Models/Series |
|
737-29A1073, Revision 3 |
December 2, 1999 |
Model 737-100, -200, -300, -400, and –500 |
|
737-29A1081 |
December 2, 1999 |
Model 737-600, -700, and -800 |
|
757-29A0048, Revision 3 |
December 2, 1999 |
Model 757-200 |
|
757-29A0051 |
December 2, 1999 |
Model 757-300 |
|
767-29A0083, Revision 4 |
September 28, 2000 |
Model 767 |
Effective date: August 09, 2001
Compliance: Required as indicated in FAA AD 2001-11-07.
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
2001-11-07 BOEING: Amendment 39-12249. Docket 98-NM-298-AD.
Applicability: Model 737, 757, and 767 series
airplanes, certificated in any category, as listed in the following Boeing
Service Bulletins:
Table 1. Effectivity.
|
Boeing Service Bulletin |
Date |
Affected Models/Series |
|
737-29A1073, Revision 3 |
December 2, 1999 |
Model 737-100, -200, -300, -400, and –500 |
|
737-29A1081 |
December 2, 1999 |
Model 737-600, -700, and -800 |
|
757-29A0048, Revision 3 |
December 2, 1999 |
Model 757-200 |
|
757-29A0051 |
December 2, 1999 |
Model 757-300 |
|
767-29A0083, Revision 4 |
September 28, 2000 |
Model 767 |
Note 1: Only motor operated hydraulic shutoff valves
manufactured by Circle Seal Controls that are installed in the locations
specified in the applicable alert service bulletin listed in the table above
are subject to this AD.
Note 2: 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 (c) 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 prevent failure of the motor operated hydraulic
shutoff valves, which could result in leakage of hydraulic fluid to the engine
fire zone, reduced ability to retract the landing gear, loss of backup
electrical power or other combinations of failures, and consequent reduced
controllability of the airplane, accomplish the following:
Repetitive Operational Checks/Corrective Action
(a) Within 6 months after the effective date of this
AD: Perform an operational check to detect malfunctioning of any Circle Seal
Controls motor operated hydraulic shutoff valve in a "sensitive
system" application (as defined in the applicable service bulletin) having
a part number specified in the "Existing Part Number" column
(including parts marked with the suffix "R" after the serial number),
of Paragraph 2.E. of Boeing Alert Service Bulletins 737-29A1073,
Revision 3 (for Model
737-100, -200, -300, -400, and -500 series
airplanes), 737-29A1081 (for Model 737-600, -700, and –800 series airplanes),
757-29A0048, Revision 3 (for Model 757-200 series airplanes), or
757-29A0051 (for Model 757-300 series airplanes); all dated December 2, 1999;
or Boeing Service Bulletin 767-29A0083, Revision 4, dated September 28,
2000 (for Model 767 series airplanes); as applicable; in accordance with
the applicable service bulletin.
(1) If any malfunction of any valve is detected,
prior to further flight, replace the valve with a new or serviceable Whittaker
Controls or Circle Seal Controls valve in accordance with the applicable
service bulletin. Repeat the operational check thereafter at intervals not to
exceed 6 months until accomplishment of the terminating action required by
paragraph (b) of this AD on all subject valves.
(2) If no malfunction of any valve is detected,
repeat the operational check thereafter at intervals not to exceed
6 months until accomplishment of the terminating action required by
paragraph (b) of this AD on all subject valves.
Note 3: Operational checks done before the effective
date of this AD per Boeing Alert Service Bulletin 737-29A1073, Revision 2 (for
Model 737 series airplanes), or 757-29A0048, Revision 2 (for Model 757 series
airplanes), both dated July 1, 1999; or 767-29A0083, Revision 2, dated July 15,
1999 (for Model 767 series airplanes); as applicable; is acceptable for
compliance with paragraph (a) of this AD.
Terminating Action
(b) Within
3 years after the effective date of this AD, accomplish the replacement of any
Circle Seal Controls valve in a "sensitive system" application (as
defined in the applicable service bulletin) having a P/N specified in the
"Existing Part Number" column (including parts marked with the suffix
"R" after the serial number), of Paragraph 2.E. of Boeing Alert
Service Bulletin 737-29A1078 (for Model 737-100, -200, -300, -400, and –500
series airplanes), 737-29A1082 (for Model 737-600, -700, and –800 series
airplanes), 757-29A0049 (for Model 757-200 series airplanes), 757-29A0052 (for
Model 757-300 series airplanes), or 767-29A0090 (for Model 767 series
airplanes); all dated December 7, 2000; as applicable. Replace an existing part
with a new Whittaker Controls valve having a P/N specified in the "New
Part Number" column of Paragraph 2.E. of the applicable service bulletin;
or with a new Circle Seal Controls valve having P/N S270T010-10, -11, -12, -13,
-14, or –15; as applicable. Do the replacement in accordance with the
applicable alert service bulletin. Accomplishment of this replacement
constitutes terminating action for the repetitive operational checks required
by this AD.
Note 4: Replacement of Circle Seal Controls valves
done before the effective date of this AD per Boeing Alert Service Bulletin
737-29A1073, Revision 2 (for Model 737 series airplanes), or 757-29A0048,
Revision 2 (for Model 757 series airplanes), both dated July 1, 1999; or
767-29A0083, Revision 2, dated July 15, 1999 (for Model 767 series airplanes);
as applicable; is acceptable for compliance with paragraph (b) of this AD.
Alternative Methods of Compliance
(c) 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
(d) Special flight permits may be issued in
accordance with sections 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
(e) The actions shall be done in accordance with
Boeing Alert Service Bulletin 737-29A1073, Revision 3, dated December 2,
1999; Boeing Alert Service Bulletin 737-29A1081, dated December 2, 1999: Boeing
Alert Service Bulletin 757-29A0048, Revision 3, dated December 2, 1999;
Boeing Alert Service Bulletin 757-29A0051, dated December 2, 1999; Boeing
Service Bulletin 767-29A0083, Revision 4, dated September 28, 2000;
Boeing Alert Service Bulletin 737-29A1078, dated December 7, 2000; Boeing
Alert Service Bulletin 737-29A1082, dated December 7, 2000; Boeing Alert
Service Bulletin 757-29A0049, dated December 7, 2000; Boeing Alert Service
Bulletin 757-29A0052, dated December 7, 2000; or Boeing Alert Service
Bulletin 767-29A0090, dated December 7, 2000; as applicable. 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
(f) This amendment becomes effective on July 16,
2001.
FOR FURTHER INFORMATION CONTACT: Kenneth W. Frey,
Aerospace Engineer, Systems and Equipment Branch, ANM-130S, FAA, Seattle Aircraft
Certification Office, 1601 Lind Avenue, SW., Renton, Washington 98055-4056;
telephone (425) 227-2673; fax (425) 227-1181.
Issued in Renton, Washington, on May 25, 2001.
Vi L. Lipski, Manager, Transport Airplane
Directorate, Aircraft Certification Service.