AD 2015-16-05 Airworthiness Directives; British Aerospace Regional Aircraft Airplanes

Models named: 3201. Read the applicability below — it usually turns on serial or part numbers too.

This AD applies to British Aerospace Regional Aircraft Jetstream Series 3101 and Jetsream Model 3201 airplanes, all serial numbers, certificated in any category.

Unless already done, do the actions in paragraphs (f)(1) through (f)(4) of this AD, including all subparagraphs, following the Accomplishment Instructions in British Aerospace Jetstream Series 3100 & 3200 Service Bulletin 57-JA120141, REVISION 1, dated April 8, 2014: (1) This AD allows credit for the actions required in paragraphs (f)(3) and (f)(4), including all subparagraphs, of this AD if done before September 21, 2015 (the effective date of this AD) following the Accomplishment Instructions of British Aerospace Jetstream Series 3100 & 3200 Service Bulletin 57-JA120141, Original Issue, dated: July 31, 2012. (2) For the purposes of this AD, owner/operators who do not track total flight cycles (FC) must multiply the total number of airplane hours time-in-service by 0.75 to calculate the FC. (3) For Pre-Mod JM5218 airplanes: Within 250 FC after September 21, 2015 (the effective date of this AD), do a magnetic particle inspection (MPI) of each MLG trunnion cap tension bolt. (i) If no crack is found during the MPI required by paragraph (f)(1) of this AD, before further flight, either re-install the crack-free bolt(s) or install a replacement bolt(s) having the same part number (P/N) as the original bolt. Install a countersunk washer under the bolt(s) ensuring the washer P/N is applicable to the diameter bolt installed as specified in figure 1 of paragraph (f)(3)(i) of this AD. Figure 1 of Paragraph (f)(3)(i) —Pre-Mod JM5218 Replacement Parts Bolt P/N Washer P/N MS21250H06040 PKS1000-6-2-S (washer). MS21250H07040 PKS1000-7-2-S (washer). (ii) If a cracked bolt is found during the inspection required by paragraph (f)(3) of this AD, before further flight, replace each cracked bolt with a replacement bolt having the same P/N as the original bolt. Install a countersunk washer under the bolt ensuring the washer P/N is applicable to the diameter bolt installed as specified in figure 1 of paragraph (f)(3)(i) of this AD. (4) For Post-Mod JM5218 airplanes: Within 250 FC after September 21, 2015 (the effective date of this AD), visually inspect each MLG trunnion cap tension bolt to determine which type of bolt is installed. (i) If it is determined the installed bolts are P/N MS21134H07045 or P/N MS21134H07059 during the inspection required in paragraph (f)(4) of this AD, before further flight (except as specified in paragraph (f)(4)(i)(A) of this AD), replace each `old' bolt P/N with a `new' bolt P/N as specified in figure 2 of paragraph (f)(4)(i) of this AD and install a washer having P/N PKS1000-7-2-S under each bolt. Figure 2 of Paragraph (f)(4)(i) —Post-Mod JM5218 Replacement Parts Bolt P/N `Old' Bolt P/N `New' MS21134H07045 MS21134H07046, or MS21250H07046. MS21134H07059 MS21134H07060, or MS21250H07060. (A) If no `new' replacement bolt is available to comply with paragraph (f)(4)(i) of this AD, the `old' bolt may be reinstalled without a countersunk washer, provided that within 500 FC after reinstallation and repetitively thereafter at intervals not to exceed 500 FC, each affected bolt is inspected by MPI. (B) Within 2,000 FC after reinstallation of a bolt as allowed by paragraph (f)(4)(i)(A) of this AD or before further flight if a crack was found during any MPI as required by paragraph (f)(4)(i)(A) of this AD, whichever occurs first, replace the `old' bolt P/N with a `new' bolt P/N as specified in figure 2 of paragraph (f)(4)(i) of this AD and install a washer having P/N PKS1000-7-2-S under each bolt. (ii) If it is determined the installed bolts are P/N MS21250H07046 or P/N MS21250H07060 and no countersunk washer is installed during the inspection required in paragraph (f)(4) of this AD, before further flight, do an MPI of each MLG trunnion cap tension bolt. (A) If no crack is found during the MPI required by paragraph (f)(4)(ii) of this AD, before further flight, either re-install the crack-free bolts or install replacement bolts having a `new' bolt P/N as specified in figure 2 of paragraph (f)(4)(i) of this AD and install a countersunk washer P/N PKS1000-7-2-S under each bolt. (B) If any crack is found during the MPI required by paragraph (f)(4)(ii) of this AD, before further flight, replace each cracked bolt with a serviceable one having a `new' bolt P/N as specified in figure 2 of paragraph (f)(4)(i) of this AD and install a countersunk washer P/N PKS1000-7-2-S under each bolt.

The following provisions also apply to this AD: (1) Alternative Methods of Compliance (AMOCs): The Manager, Standards Office, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. Send information to ATTN: Doug Rudolph, Aerospace Engineer, FAA, Small Airplane Directorate, 901 Locust, Room 301, Kansas City, Missouri 64106; telephone: (816) 329-4059; fax: (816) 329-4090; email: doug.rudolph@faa.gov . Before using any approved AMOC on any airplane to which the AMOC applies, notify your appropriate principal inspector (PI) in the FAA Flight Standards District Office (FSDO), or lacking a PI, your local FSDO. (2) Airworthy Product: For any requirement in this AD to obtain corrective actions from a manufacturer or other source, use these actions if they are FAA-approved. Corrective actions are considered FAA-approved if they are approved by the State of Design Authority (or their delegated agent). You are required to assure the product is airworthy before it is returned to service.

This AD was prompted by mandatory continuing airworthiness information (MCAI) originated 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 missing countersunk washers under the head of the main landing gear (MLG) trunnion cap tension bolts that could cause fatigue in the bolt shanks. We are issuing this AD to detect and correct missing countersunk washers, which could lead to failure of the bolt(s), thereby compromising the structural integrity of the other MLG tension bolts holding the MLG in place, possibly resulting in collapse of the MLG on take-off or landing with consequent damage to the airplane and injury to occupants.

None.