# AD 87-12-09 R1: Aileron Weight Attach Rivets - Type: Airworthiness directive - Status: Current - Products: SOCATA TB 20 and TB 21 - Effective: June 25, 1989 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Small airplane - Amendment: 39-6224 - Registered aircraft: 250 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/8BC67623C51CB7CF86256A4D00483313.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/87-12-09-R1 ## The airworthiness directive 87-12-09 R1 SOCATA GROUPE AEROSPATIALE: Amendment 39-5650 as revised by Amendment 39-6224. Applicability: Models TB 20 and TB 21 (Serial Numbers 275 through 700) airplanes certificated in any category. Compliance: Required within the next 50 hours time-in-service (TIS) after the effective date of this AD, and each 100 hours TIS thereafter, unless already accomplished in accordance with the original issuance of AD 87-12-09. To prevent structural failure of the aileron, possible flutter, and loss of control, accomplish the following: (a) Visually inspect the five aileron balance weight attachment rivets for any detectable looseness, and the aileron skin for cracks using the procedures described in paragraph A, SOCATA TB Service Bulletin (S/B) No. 28, dated December 1986. (1) If one or more loose rivets, or cracks extending less than 9/16 inch (15 mm) from the center of the rivet is found, prior to further flight, repair as described in paragraph B of SOCATA TB AircraftS/B No. 28, dated December 1986. (2) If a crack 9/16 inch or longer from the center of the rivet is found, prior to further flight, replace the P/N TB 20.15.001.000 aileron with P/N TB 20.15.001.001 or P/N TB 20.15.001.002 aileron as applicable. (b) The repetitive inspections specified in this AD are no longer required when the ailerons have been repaired or replaced per the actions specified in either paragraph (a)(1), or (a)(2) above. (c) Airplanes may be flown in accordance with FAR 21.197 to a location where this AD may be accomplished. (d) An equivalent means of compliance with this AD may be used if approved by the Manager, Brussels Aircraft Certification Office, FAA, AEU-100, Europe, Africa, and Middle East Office, c/o American Embassy, B-1000 Brussels, Belgium; Telephone (322) 513.38.30. All persons affected by this directive may obtain copies of document(s) referred to herein upon request to SOCATA Groupe AEROSPATIALE, B.P. 38, 65001 Tarbes, France; Telephone 62.51.73.00 or 62.93.99.45 (for recorder); or the Product Support Manager, U.S., AEROSPATIALE, 2701 Forum Drive, Grand Prairie, Texas, 75053; Telephone (214) 641-3614; or may examine these documents referred to herein at the FAA, Office of the Assistant Chief Counsel, Room 1558, 601 East 12th Street, Kansas City, Missouri 64106. This AD revises AD 87-12-09, Amendment 39-5650, which became effective on June 26, 1987. This amendment (39-6224, AD 87-12-09 R1) becomes effective on June 25, 1989. ## Affected data sheets (1) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS A51EU](https://openairdocs.org/tcds/A51EU): Daher Aerospace; names 2 of 5 models: TB 21, TB 20 ## Registered aircraft it may apply to (OpenAirDocs) Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment. - Aircraft: 250 (250 by airframe model, 0 by engine model) - Makers: Socata 250 Models with the most aircraft: - [Socata TB-20 TRINIDAD](https://openairdocs.org/model/socata-tb-20-trinidad): 175 aircraft (airframe model) - [Socata TB21](https://openairdocs.org/model/socata-tb21): 50 aircraft (airframe model) - [Socata TB20](https://openairdocs.org/model/socata-tb20): 25 aircraft (airframe model) All 3 models: https://openairdocs.org/ad/87-12-09-R1/models.md Every aircraft: https://openairdocs.org/ad/87-12-09-R1/aircraft.md Its text cites no advisory circulars or STCs. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.