# AD 90-02-18 R1: Fuel System - Type: Airworthiness directive - Status: Current - Products: SOCATA TB 10, TB 20, TB 21 and TB9 - Effective: June 13, 1990 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Small airplane - Amendment: 39-6619 - Docket: 89-CE-37-AD - Registered aircraft: 304 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/4FB3A961770C022086256A640067B999.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/90-02-18-R1 ## The airworthiness directive 90-02-18 R1 SOCATA GROUPE AEROSPATIALE: Amendment 39-6454 as revised by Amendment 39-6619. Docket No. 89-CE-37-AD. Applicability: Models TB 9 and TB 10, TB 20, and TB 21 (all serial numbers (S/N)) airplanes certificated in any category. Compliance: As indicated in the body of the AD, unless already accomplished per AD 90-02-18. To preclude loss of power due to contamination of the fuel system, accomplish the following: (a) Within the next 75 hours time-in-service (TIS) from February 6, 1990, except as indicated in paragraph (c) of this AD, modify the fuel system by the installation of the following applicable SOCATA modification kit, as described in SOCATA Service Bulletin (SB) Number 48/2, dated March 1990: Airplanes Kit Number All TB airplanes (S/N 1 through 822, 850 through 887, 889 and subsequent) 9154 Airplanes Kit Number TB 20 (S/N 823 through 849, and 888) 9155 (b) For Models TB 20 and TB 21 (S/N 1 through 730)airplanes (unless modified with SOCATA Modification Number 66), within the next 75 hours TIS from February 6, 1990, except as indicated in paragraph (d) of this AD, modify the fuel system by replacement of the installed Dukes fuel pump with a Weldon fuel pump and the addition of a check valve, in accordance with the instructions contained in SOCATA SB Number 47/1, dated October 1989. (c) If the required parts are not available to accomplish the modification specified in paragraph (a) of this AD, the airplane may continue operation for an additional 150 hours TIS after the compliance time specified in paragraph (a) of this AD provided the fuel tank sump is drained at intervals not to exceed each 50 hours TIS in accordance with the procedures specified in the DESCRIPTION section of SOCATA SB 48/2, dated March 1990. (d) If the required parts are not available to accomplish the modifications specified in paragraph (b) of this AD, the airplane may continue operation for an additional 150 hours TIS after the compliance time specified in paragraph (b) of this AD provided the following preflight actions are accomplished by the pilot prior to each engine start: (i) Select battery (main switch) ON. (ii) Advance the mixture control to FULL RICH. (iii) Select electric fuel boost pump ON. (iv) Advance the throttle until a positive fuel flow is observed on the fuel flow gauge, then retard the throttle and move the mixture control to IDLE/CUTOFF. (v) Select electric fuel boost pump OFF. (vi) Select battery (main switch) OFF. (vii) Visually inspect the electric fuel boost pump area for leaks. (viii) If no positive fuel flow is observed on the fuel flow gauge, or fuel leaks are detected from the electric fuel boost pump, repair or replace the defective component prior to further flight. NOTE: Avoid moving the propeller and standing in the propeller area while inspecting the engine. (e) Airplanes may be flown in accordance withFAR 21.197 to a location where this AD may be accomplished. (f) An alternate method of compliance or adjustment of the initial or repetitive compliance times which provides an equivalent level of safety may be approved by the Manager, Brussels Aircraft Certification Office, FAA, Europe, Africa, and Middle East Office, c/o American Embassy, B-1000 Brussels, Belgium. NOTE: The request should be forwarded through an FAA Maintenance Inspector, who may add comments and then send it to the Manager, Brussels Aircraft Certification Office. All persons affected by this directive may obtain copies of the documents referred to herein upon request to SOCATA Groupe Aerospatiale, B.P. 38, 65001 Tarbes, Cedex, France; Telephone 62.51.73.00, or 62.51.73.55 (for Telefax); or the Product Support Manager, U.S., AEROSPATIALE, 2701 Forum Drive, Grand Prairie, Texas 73053; Telephone (214) 641-3614; or may examine these documents at the FAA, Central Region, Office of the Assistant Chief Counsel, Room 1558, 601 E. 12th Street, Kansas City, Missouri 64106. This AD revises AD 90-02-18, Amendment 39-6454. This amendment (39-6619, AD 90-12-18 R1) becomes effective on June 13, 1990. ## 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 4 of 5 models: TB9, TB 21, TB 20, TB 10 ## 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: 304 (304 by airframe model, 0 by engine model) - Makers: Socata 303, Socata Group Aerospatiale 1 Models with the most aircraft: - [Socata TB-20 TRINIDAD](https://openairdocs.org/model/socata-tb-20-trinidad): 175 aircraft (airframe model) - [Socata TB 10](https://openairdocs.org/model/socata-tb-10): 53 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) - [Socata Group Aerospatiale TB9](https://openairdocs.org/model/socata-group-aerospatiale-tb9): 1 aircraft (airframe model) All 5 models: https://openairdocs.org/ad/90-02-18-R1/models.md Every aircraft: https://openairdocs.org/ad/90-02-18-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.