AD 96-02-06

96-02-06 BOEING; MCDONNELL DOUGLAS; LOCKHEED; FOKKER; AND BRITISH AEROSPACE REGIONAL AIRCRAFT LIMITED, AVRO INTERNATIONAL AEROSPACE DIVISION (Formerly British Aerospace, plc; British Aerospace Commercial Aircraft, Limited): Amendment 39-9494. Docket 95-NM-55-AD. Supersedes AD 95-04-01, Amendment 39-9153; and AD 95-09-05, Amendment 39-9208.

Applicability: The following models and series of airplanes, certificated in any category, equipped with Honeywell Standard Windshear Detection Systems (WSS):

Manufacturer and Model of Airplane

Type of Computer

Part Numbers Boeing 727-100 and -200 Standard Windshear (Honeywell STC) 4061048-902, -903, and-904 4068054-901 4068060-901 Boeing 737-100 and -200 Standard Windshear

4061048-903, -904, and -905 4068058-903 Boeing 737-200 Performance Management (Honeywell STC) 4050730-904 through -911 4051819-906 Boeing 737-300 Standard Windshear (Honeywell STC) 4068060-901 Boeing 747-100 and -200 Standard Windshear (Honeywell STC) 4061048-904 McDonnell Douglas DC-8-50, -60, and -70 Standard Windshear (Honeywell STC) 4068046-903 McDonnell Douglas DC-9-10, -21, -31 -41, and -51 Standard Windshear (Honeywell STC) 4068046-901, -902 4068048-901, -902 McDonnell Douglas DC-9-80 and MD-88 Windshear (OEM TC) 4059845-902 McDonnell Douglas MD-90-30 Windshear (OEM TC) 4059845-910 McDonnell Douglas MD-11 Flight Control (OEM TC) 4059001-901 through -905 (with windshear option selected) Lockheed L-1011-385-1, -385-1-14, -385-1-15, and -385-3 Standard Windshear (OEM TC) 4068044-901 Fokker F28 Mark 1000, 2000, 3000, and 4000 Standard Windshear (Honeywell STC) 4068052-901 Fokker F28 Mark 0100 Flight Management (OEM TC) 4052502-951 (with windshear option selected) British Aerospace Avro 146-RJ70A, -RJ85A, and -RJ100A Flight Control (OEM TC) 4068300-902

NOTE 1: This AD applies to each airplane identified in the precedingapplicability 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 use the authority provided in paragraph (d) of this AD to request approval from the FAA. This approval may address either no action, if the current configuration eliminates the unsafe condition; or different actions necessary to address the unsafe condition described in this AD. Such a request should include an assessment of the effect of the changed configuration on the unsafe condition addressed by this AD. In no case does the presence of any modification, alteration, or repair remove any airplane from the applicability of this AD.

Compliance: Required as indicated, unless accomplished previously.

To prevent significant delays in the Honeywell Standard Windshear Detection Systems(WSS) detecting hazardous windshear, which could lead to the loss of flight path control, accomplish the following:

(a) Revise the Limitations Section of the FAA-approved Airplane Flight Manual (AFM) to include the following statement, at the time specified in either paragraph (a)(1) or (a)(2) of this AD, as applicable. This may be accomplished by inserting a copy of this AD in the AFM.

"During sustained banks of greater than 15 degrees or during flap configuration changes, the Honeywell Windshear Detection and Recovery Guidance System (WSS) is desensitized and alerts resulting from encountering windshear conditions will be delayed."

(1) For all Boeing, McDonnell Douglas, Lockheed, and Fokker airplanes specified in the applicability statement of this AD: Within 14 days after March 8, 1995 (the effective date of AD 95-04-01, amendment 39-9153).

(2) For British Aerospace Model Avro airplanes specified in the applicability statement of this AD: Within 14 days after May 15, 1995 (the effective date of AD 95-09-05, amendment 39-9208).

(b) Within 36 months after the effective date of this AD, replace the currently-installed line replaceable unit (LRU) with a modified LRU having new software that eliminates delays in the WSS detecting windshear when the flaps of the airplane are in transition, in accordance with a method approved by the Manager, Los Angeles Aircraft Certification Office (ACO), FAA, Transport Airplane Directorate. Accomplishment of this replacement constitutes terminating action for the requirements of paragraph (a) of this AD; after the replacement has been accomplished, the AFM limitation required by paragraph (a) of this AD may be revised to read as follows:

"During sustained banks of greater than 15 degrees, the Honeywell Windshear Detection and Recovery Guidance System (WSS) is desensitized and alerts resulting from encountering windshear conditions will be delayed."

(c) As of 18 months after the effective dateof this AD, no person shall install on any airplane an LRU that has not been modified in accordance with paragraph (b) of this AD. An unmodified LRU may be installed up to 18 months after the effective date of this AD, provided that, during that time, the AFM limitation required by paragraph (a) of this AD remains in effect.

(d) 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, Los Angeles ACO. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Los Angeles ACO.

NOTE 2: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Los Angeles ACO.

(e) 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.

(f) This amendment becomes effective on February 26, 1996.