Airworthiness Directive · Amendment 39-11955 · British Aerospace (Jetstream) Model 4101 Airplanes
British Aerospace (Jetstream) Model 4101 Airplanes
Model Jetstream 4101 airplanes, certified in any category; on which any APPH main landing gear (MLG) retract actuator having part number AIR86496, any suffix, is installed.
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 certain British Aerospace (Jetstream) Model 4101 airplanes, that requires inspection of certain components, and corrective action, if necessary. The actions specified by this AD are intended to prevent loosening of the locknut holding the main landing gear (MLG) piston to the ramrod, which could result in detachment of the MLG piston from the ramrod and loss of hydraulic control of the MLG. This action is intended to address the identified unsafe condition.
To prevent loosening of the locknut holding the MLG piston to the ramrod, which could result in detachment of the MLG piston from the ramrod and loss of hydraulic control of the MLG, accomplish the following:
(a) Within 18 months after the effective date of this AD: Inspect the airplane records to determine the overhaul status and number of landings on the left and right MLG retract actuators, and inspect the actuators for the presence of ink mark “32-03,” in accordance with Jetstream Service Bulletin J41-32-068, Revision 1, dated May 12, 2000.
(1) If both actuators have been overhauled and ink mark “32-03” is present on each actuator, no further action is required by this AD.
(2) For any actuator that has been overhauled but does not have ink mark “32-03” present on the actuator: Within 2 years after the effective date of this AD, accomplish all applicable corrective actions for that actuator (including inspection of locknut peening, lockwasher replacement, and ink marking), in accordance with Part 3 or Part 4, as applicable, of the Accomplishment Instructions of the service bulletin.
(3) For any actuator that has not been overhauled: Prior to further flight, or prior to the accumulation of 8,000 total landings on that actuator, whichever occurs later, replace the actuator with an overhauled actuator having ink mark “32-03” present, in accordance with Part 1 or Part 2, as applicable, of the Accomplishment Instructions of the service bulletin.
Note 2: Jetstream Service Bulletin J41-32-068, Revision 1, dated May 12, 2000, refers to APPH Service Bulletin AIR86496-32-03, Revision 2, dated March 2000, as an additional source of service information for the inspection of locknut peening and the lockwasher replacement.
(b) As of the effective date of this AD, no APPH MLG retract actuator having P/N AIR86496, any suffix, may be installed on any airplane unless the actuator is marked with ink mark “32-03.”
