Airworthiness Directive · Amendment 39-14891 · SOCATA-Groupe Aerospatiale TB 20 and TB 21 Airplanes
SOCATA-Groupe Aerospatiale TB 20 and TB 21 Airplanes
This AD applies to SOCATA Models TB 20 and TB 21 airplanes, serial numbers 1 through 9999 without repair REP 20.031 implemented on both sides, certificated in any category.
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 reports of interference between the wing spar lower boom and the wheel fairing attaching screw. We are issuing this AD to require actions to correct the unsafe condition on these products.
Unless already done, do the following actions.
(1) Within the next 100 hours time-in-service or 12 months after the effective date of this AD, whichever occurs first, perform an inspection of the wing spar lower boom and repair it as necessary, in accordance with the accomplishment instructions of the EADS SOCATA TB Aircraft Mandatory Service Bulletin SB 10-148, ATA No. 57, dated December 2005.
(2) If defect dimensions exceed the acceptable values given in the EADS SOCATA TB Aircraft Mandatory Service Bulletin SB 10-148, ATA No. 57, dated December 2005, or if the defect is not located in areas depicted in figure 2 of the EADS SOCATA TB Aircraft Mandatory Service Bulletin SB 10-148, ATA No. 57, dated December 2005, then the Type 1 or Type 2 repair solutions are not applicable. A written report shall be sent to the manufacturer as mentioned in section A.5 of the EADS SOCATA TB Aircraft Mandatory Service Bulletin SB 10-148, ATA No. 57, dated December 2005. In this case, all flight is prohibited until EADS SOCATA provides a repair solution or otherwise agrees to further flight.
Note: This AD differs from the MCAI and/or service information as follows: No differences.
