# AD 93-07-12: Horizontal Stabilizer Rear Spar Inspection - Type: Airworthiness directive - Status: Current - Products: M7 Aerospace SA226-AT, SA226-T, SA226-TC, SA226-T(B), SA227-AC (C-26A), SA227-AT and SA227-TT - Effective: May 28, 1993 - Supersedes: [AD 74-24-02](https://openairdocs.org/ad/74-24-02), [AD 74-24-02 R1](https://openairdocs.org/ad/74-24-02-R1) - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Small/large airplane - Amendment: 39-8544 - Docket: 91-CE-36-AD - Registered aircraft: 148 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/F435DBDFB3D5CADF86256984007234A6.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/93-07-12 ## The airworthiness directive 93-07-12 FAIRCHILD AIRCRAFT (formerly Swearingen Aircraft Corporation): Amendment 39-8544. Docket No. 91-CE-36-AD. Supersedes AD 74-24-02, Amendment 39-2529. Applicability: The following model and serial number airplanes, certificated in any category: Models Serial Numbers SA226-T, SA226-T(B) SA226-AT, and SA226-TC all serial numbers SA227-TT TT421 through TT527 SA227-AC AC406, AC415, AC416, AC420 through AC509, and AC511 through AC530 SA227-AT AT423 through AT524 Compliance: Required as indicated after the effective date of this AD, unless already accomplished. To prevent failure of the horizontal stabilizer rear spar, which could result in loss of control of the airplane, accomplish the following: (a) Within the next 50 hours time-in-service (TIS), unless already accomplished within the last 450 hours TIS, and thereafter at intervals not to exceed 500 hours TIS until the modification required by paragraph (b) of this AD is accomplished,dye penetrant inspect the horizontal stabilizer rear spar at the left and right outboard elevator hinge bracket attachment for cracks in accordance with the ACCOMPLISHMENT INSTRUCTIONS section of Fairchild Aircraft Service Bulletin (SB) 226-55-005, Issued: August 15, 1985, Revised: January 7, 1991; or Fairchild Aircraft SB 227-55-002, Issued: August 15, 1985, Revised: October 13, 1988, as applicable. (b) If cracks are found in the horizontal stabilizer rear spar, prior to further flight, repair any crack in accordance with a repair scheme obtained from the manufacturer through the Manager, Fort Worth Airplane Certification Office, at the address specified in paragraph (f) of this AD. (c) Within the next 2,200 hours TIS, modify the outboard hinge in accordance with the ACCOMPLISHMENT INSTRUCTIONS section of Fairchild Aircraft SB 226-55-005, Issued: August 15, 1985, Revised: January 7, 1991; or Fairchild Aircraft SB 227-55-002, Issued: August 15, 1985, Revised: October 13,1988, as applicable. (d) The accomplishment of the modification required by paragraph (c) of this AD is considered terminating action for the repetitive inspection requirement of this AD. This modification may be accomplished at any time prior to 2,200 hours TIS. (e) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate the airplane to a location where the requirements of this AD can be accomplished. (f) An alternative method of compliance or adjustment of the initial or repetitive compliance times that provides an equivalent level of safety may be approved by the Manager, Airplane Certification Office, FAA, Fort Worth, Texas 76193-0150. The request shall be forwarded through an appropriate FAA Maintenance Inspector, who may add comments and then send it to the Manager, Fort Worth Airplane Certification Office. NOTE: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may beobtained from the Fort Worth Airplane Certification Office. (g) The inspections and modification required by this AD shall be done in accordance with Fairchild Aircraft Service Bulletin 226-55-005, Issued: August 15, 1985, Revised: January 7, 1991; or Fairchild Aircraft Service Bulletin 227-55-002, Issued: August 15, 1985, Revised: October 13, 1988, as applicable. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR Part 51. Copies may be obtained from Fairchild Aircraft, P.O. Box 790490, San Antonio, Texas 78279-0490. Copies may be inspected at the FAA, Central Region, Office of the Assistant Chief Counsel, Room 1558, 601 E. 12th Street, Kansas City, Missouri, or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (h) This amendment (39-8544) supersedes AD 74-24-02, Amendment 39-2529, which superseded AD 74-18-14, Amendment 39-1950. (i) This amendment becomes effective on May 28, 1993. ## Affected data sheets (2) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS A5SW](https://openairdocs.org/tcds/A5SW): Ontic Engineering and Manufacturing Inc.; names 4 of 7 models: SA227-AT, SA227-TT, SA226-AT, SA226-T(B) - [TCDS A8SW](https://openairdocs.org/tcds/A8SW): Ontic Engineering and Manufacturing Inc.; names 2 of 4 models: SA226-TC, SA227-AC (C-26A) ## 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: 148 (148 by airframe model, 0 by engine model) - Makers: Swearingen 79, Fairchild 69 Models with the most aircraft: - [Fairchild SA227-AC](https://openairdocs.org/model/fairchild-sa227-ac): 54 aircraft (airframe model) - [Swearingen SA-226T](https://openairdocs.org/model/swearingen-sa-226t): 21 aircraft (airframe model) - [Swearingen SA226-T(B)](https://openairdocs.org/model/swearingen-sa226-t-b): 16 aircraft (airframe model) - [Swearingen SA227-AT](https://openairdocs.org/model/swearingen-sa227-at): 12 aircraft (airframe model) - [Swearingen SA227-TT](https://openairdocs.org/model/swearingen-sa227-tt): 11 aircraft (airframe model) - [Fairchild SA227-AT](https://openairdocs.org/model/fairchild-sa227-at): 9 aircraft (airframe model) - [Swearingen SA226TC](https://openairdocs.org/model/swearingen-sa226tc): 8 aircraft (airframe model) - [Swearingen SA227-AC](https://openairdocs.org/model/swearingen-sa227-ac): 8 aircraft (airframe model) - [Fairchild SA226-T(B)](https://openairdocs.org/model/fairchild-sa226-t-b): 3 aircraft (airframe model) - [Swearingen SA-226AT](https://openairdocs.org/model/swearingen-sa-226at): 3 aircraft (airframe model) - [Fairchild SA226-TC](https://openairdocs.org/model/fairchild-sa226-tc): 1 aircraft (airframe model) - [Fairchild SA226-T](https://openairdocs.org/model/fairchild-sa226-t): 1 aircraft (airframe model) - [Fairchild SA226-AT](https://openairdocs.org/model/fairchild-sa226-at): 1 aircraft (airframe model) All 13 models: https://openairdocs.org/ad/93-07-12/models.md Every aircraft: https://openairdocs.org/ad/93-07-12/aircraft.md ## Related documents - [AD 74-24-02](https://openairdocs.org/ad/74-24-02) (historical): Horizontal Stabilizer Rear Spar · M7 Aerospace LP SA226-AT, SA226-T and SA226-TC. Effective Mar 8, 1976. Replaced by this AD - [AD 74-24-02 R1](https://openairdocs.org/ad/74-24-02-R1) (historical): Horizontal Stabilizer Rear Spar · M7 Aerospace LP SA226-AT, SA226-T and SA226-TC. Effective Mar 8, 1976. Replaced by this AD 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.