Airworthiness Directive · Amendment 39-22081 · Main landing gear attach section
British Aerospace (Operations) Limited and British Aerospace Regional Aircraft Airplanes
This AD applies to British Aerospace (Operations) Limited Model HP.137 Jetstream Mk.1, Jetstream Series 200, and Jetstream Model 3101 airplanes and British Aerospace Regional Aircraft Model Jetstream Model 3201 airplanes, all serial numbers, certificated in any category.
The FAA is superseding Airworthiness Directive (AD) 2017-15-06 for all British Aerospace Regional Aircraft Model HP.137 Jetstream Mk.1, Jetstream Series 200 and 3101, and Jetstream Model 3201 airplanes. AD 2017-15-06 required repetitively inspecting the main landing gear (MLG) for cracks and, if cracks were found, replacing the MLG with an airworthy part. Since the FAA issued AD 2017-15-06, the Civil Aviation Authority (CAA) of the United Kingdom (UK) superseded the mandatory continuing airworthiness information (MCAI) issued by the European Aviation Safety Agency (EASA) to correct an unsafe condition on these products. This AD retains the initial inspection and the calculation of hours time-in-service to flight cycle actions required by AD 2017-15-06, but decreases the repetitive inspection interval time from 1,200 flight cycles to 900 flight cycles. The FAA is issuing this AD to address the unsafe condition on these products.
(1) Within the compliance times listed in paragraph (g)(1)(i) or (ii) of this AD, as applicable, inspect the MLG for cracks by following Appendix 1, sections A through G, of British Aerospace Jetstream Series 3100 & 3200 Service Bulletin 32-JA960142, Revision 5, dated December 13, 2019; or the Accomplishment Instructions, sections A through D(6), in Héroux Devtek Service Bulletin 32-56, Revision 4, dated August 16, 2016.
(i) For airplanes that have been inspected in accordance with AD 2017-15-06: Before the MLG accumulates 900 flight cycles since the last inspection or within 150 flight cycles after the effective date of this AD, whichever occurs later, and thereafter at intervals not to exceed 900 flight cycles.
(ii) For airplanes that have not been inspected in accordance with AD 2017-15-06: Before the MLG accumulates 8,000 flight cycles since first installation on an airplane or within 50 flight cycles after the effective date of this AD, whichever occurs later, and thereafter at intervals not to exceed 900 flight cycles.
(2) If any crack is found during any inspection required by paragraph (g)(1) of this AD, before further flight, replace the MLG with an airworthy MLG and continue the inspections as required by paragraph (g)(1) of this AD.
(3) The compliance times in paragraphs (g)(1)(i) and (ii) of this AD are presented in flight cycles (landings). If the number of total flight cycles is unknown, for purposes of this AD, the number of flight cycles is the hours time-in-service (TIS) accumulated on the airplane multiplied by 0.75. For example:
(i) 100 hours TIS × 0.75 = 75 flight cycles.
(ii) 1,000 hours TIS × 0.75 = 750 flight cycles.
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.
