Airworthiness Directive · Amendment 39-11492 · British Aerospace Model BAC 1-11 200 and 400 Series Airplanes
British Aerospace Model BAC 1-11 200 and 400 Series Airplanes
All Model BAC 1-11 200 and 400 series airplanes, certificated in any category.
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 (e) 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.
This amendment adopts a new airworthiness directive (AD), applicable to to all British Aerospace Model BAC 1-11 200 and 400 series airplanes, that requires replacing the thrust reverser control unit selector valve with a new or modified valve and inspecting for proper rigging of the thrust reverser cable drums and thrust reverser control unit selector valve detent, and corrective actions, if necessary. This amendment also requires revising the Airplane Flight Manual to provide the flight crew with procedures to address uncontrolled operation of the thrust reverser system. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this AD are intended to provide the flight crew with procedures in the event of uncommanded deployment of the thrust reverser, and to prevent uncommanded deployment of the thrust reverser in flight or on the ground, which could result in reduced controllability of the airplane.
Required as indicated, unless accomplished previously.
To provide the flight crew with procedures in the event of uncommanded deployment of the thrust reverser and to prevent uncommanded deployment of the thrust reverser in flight or on the ground, which could result in reduced controllability of the airplane, accomplish the following:
(a) Within 30 days after the effective date of this AD, perform an inspection for proper rigging of the thrust reverser cable drums, in accordance with British Aerospace Alert Service Bulletin 76-A-PM6043, Issue No. 1, dated September 18, 1998. If any drum is found to be improperly rigged, prior to further flight, accomplish the adjustments specified in paragraph 3, ``Adjustments,'' of the alert service bulletin.
(b) Prior to further flight after accomplishing the inspection required by paragraph (a) of this AD, perform an inspection for proper rigging of the thrust reverser selector valve detent, in accordance with Rolls-Royce Spey Service Bulletin Sp78-131, dated September 1998. If any discrepancy is found, prior to further flight, accomplish the adjustments specified in paragraph 3, ``Adjustments,'' of the service bulletin.
(c) Within 30 days after the effective date of this AD, revise the Emergency and Abnormal Procedures Sections of the FAA-approved Airplane Flight Manual (AFM) by inserting, into the applicable sections of the AFM, British Aerospace Advance Amendment Bulletin No. 12 (for Model 400 series airplanes) or No. 16 (for Model 200 series airplanes), as applicable; both dated August 19, 1997.
(d) Within 12 months after the effective date of this AD, replace the thrust reverser control unit selector valve with a new or modified selector valve in accordance with British Aerospace Service Bulletin 78-PM6047, Revision 1, dated November 27, 1998.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
