Airworthiness Directive · Amendment 39-11539 · British Aerospace (Jetstream) Model 4101 Airplanes
British Aerospace (Jetstream) Model 4101 Airplanes
All Model Jetstream 4101 airplanes, certificated in any category.
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 (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.
This amendment adopts a new airworthiness directive (AD), applicable to all British Aerospace (Jetstream) Model 4101 airplanes, that requires manufacture and installation of a placard on the left- hand instrument panel in the cockpit to prohibit push-backs of the airplane while the engines are running. In lieu of accomplishing the placard installation, this amendment requires repetitive installation of a new tow bracket sub-assembly that has the serial number and date of installation vibro etched on it. 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 prevent fatigue failure of the towing bracket. Failure of the towing bracket could cause a towing vehicle to collide into the propeller while the airplane engines are running, and consequently, cause damage to the airplane, and injure ground personnel, flight crew, or passengers.
To prevent fatigue failure of the towing bracket, which could cause a towing vehicle to collide into the propeller while the airplane engines are running, and consequently, could cause damage to the airplane, and injure ground personnel, flight crew, or passengers, accomplish the following:
(a) Prior to the accumulation of 12,000 total landings on the shock strut of the nose landing gear (NLG), or within 5 days after the effective date of this AD, whichever occurs later: Except as provided by paragraph (b) of this AD, manufacture and install a placard on the left-hand instrument panel in the cockpit to prohibit push-backs with engines running, in accordance with Jetstream Alert Service Bulletin J41-11-024, dated May 11, 1999.
(b) In lieu of accomplishing the actions specified in paragraph (a) of this AD, at the time specified in paragraph (a) of this AD, vibro etch the serial number and date of installation on a new tow bracket sub-assembly; and install the new tow bracket sub-assembly, in accordance with Jetstream Service Bulletin J41-32-070, Revision 1, dated September 14, 1999. Repeat the vibro etch process and installation of a new sub-assembly thereafter at intervals not to exceed 12,000 landings on the shock strut of the NLG.
