Airworthiness Directive · Amendment 39-15235 · British Aerospace Regional Aircraft Model HP.137 Jetstream Mk.1, Jetstream Series 200, Jetstream Series 3101, and Jetstream Model 3201 Airplanes
British Aerospace Regional Aircraft Model HP.137 Jetstream Mk.1, Jetstream Series 200, Jetstream Series 3101, and Jetstream Model 3201 Airplanes
This AD applies to HP.137 Jetstream Mk.1, Jetstream Series 200, Jetstream Series 3101, and Jetstream Model 3201 airplanes, all serial numbers, certificated in any category.
(d) Air Transport Association of America (ATA) Code 32: Landing Gear.
We are adopting a new airworthiness directive (AD) for the products listed above. This AD results from mandatory continuing airworthiness information (MCAI) issued by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:
Unless already done, do the following actions:
(1) Initially within the next 3 months after November 28, 2007 (the effective date of this AD) and repetitively thereafter at intervals not to exceed 12 months until the replacement required by paragraph (f)(2) or (f)(3) of this AD is done, inspect the main landing gear radius rod forged cylinder flashline following the accomplishment instructions of British Aerospace Jetstream Series 3100 and 3200 Service Bulletin 32-JA060741, dated November 1, 2006.
(2) If cracks are found during any inspection required by this AD, before further flight, replace the radius rod assembly with a serviceable unit.
(i) If the radius rod assembly includes the parts described in paragraphs (f)(3)(i) and (f)(3)(ii) of this AD, then the repetitive inspections of this AD are no longer required.
(ii) If the radius rod assembly does not include the parts described in paragraphs (f)(3)(i) and (f)(3)(ii) of this AD, then continue to repetitively inspect at intervals not to exceed 12 months until you comply with paragraph (f)(3) of this AD.
(3) Upon reaching 8,000 total landings on the main landing gear radius rods or within the next 12 months November 28, 2007(the effective date of this AD), whichever occurs later, replace the radius rod assembly by installing one of the following part numbers (P/N). This terminates the repetitive inspection requirement of this AD:
(i) P/N 1847/A to 1847/L with strike-off 12 or 13, or 1847/M or later; and
(ii) P/N 1862/A to 1862/L with strike-off 12 or 13, or 1862/M or later.
(4) For airplanes under 8,000 total landings on the main landing gear radius rods: Before further flight after the initial inspection required by paragraph (f)(1) of this AD, do not install a radius rod assembly that is not one of the parts specified in paragraphs (f)(3)(i) and (f)(3)(ii) of this AD on an affected airplane, unless it has been inspected in accordance with paragraph (f)(1) of this AD.
(5) For those airplanes with parts listed in paragraph (f)(3) of this AD: Before further flight after installing the parts in paragraphs (f)(3)(i) and (f)(3)(ii) of this AD, do not install any radius rod assembly that does not incorporate the parts in paragraphs (f)(3)(i) and (f)(3)(ii) of this AD.
Note 1: When a compliance time in this AD is presented in landings and you do not keep the total landings, you may multiply the total number of airplane hours time-in-service by 0.75 to calculate the number of landings for the purposes of doing the actions required by this AD.
Note 2: Maintenance procedures for each radius rod overhaul are included in APPH Service Bulletin 1847-32-12 or 1862-32-12, both dated September 2006, as applicable. You may do such maintenance using the above referenced bulletins or through a fluorescent dye penetrant inspection of the cylinder counterbore as specified in APPH Component Maintenance Manual (CMM) 32-10-16 at Revision 11 or higher.
Note 3: This AD differs from the MCAI and/or service information as follows: (1) The MCAI and service bulletin allow the radius rod assembly to be repetitively inspected for the life of the airplane and the repetitive inspection requirement is terminated if improved design parts are installed. Many of the affected airplanes are used in commuter operations (14 CFR part 135). The FAA's policy on aging commuter class aircraft states that when a modification exists that could eliminate or reduce the number of required critical inspections, the modification should be incorporated. Therefore, the FAA is mandating the replacement of the radius rod assembly with improved design parts no later than reaching 8,000 total landings on the main landing gear radius rods or within the next 12 months after the effective date of this AD, whichever occurs later.
(2) The MCAI includes a reference to APPH service bulletins as an option for maintenance overhaul procedures. Because we do not require general maintenance in our ADs, we added a note referencing these bulletins as an option to use for overhaul procedures.
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.
