# AD 85-22-06 R1: Stall Avoidance System (SAS) - 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SA226-AT, SA226-T, SA226-TC, SA226-T(B), SA227-AC (C-26A), SA227-AT and SA227-TT - Effective: October 19, 1990 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Small/large airplane - Amendment: 39-6675 - Docket: 85-CE-11-AD - Registered aircraft: 148 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C4411BB49A3B6633862569850066A24C.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/85-22-06-R1 ## The airworthiness directive 85-22-06 R1 FAIRCHILD AIRCRAFT CORPORATION (formerly Swearingen Aviation Corporation): Amendment 39-5158 as revised by Amendment 39-6675. Docket No. 85-CE-11- AD. Applicability: Models SA226-T (Serial Numbers (S/N) T201 thru T275, T277 thru T291); SA226-AT (S/N AT001 thru AT419, AT003E, AT038E, AT062E, AT064E); SA226-TC (S/N TC201 thru TC419, TC208E, TC211E, TC211EE, TC211EEE, TC211EEEE, TC222E, TC227E, TC228E, TC229E, TC234E, TC237E, TC238E, TC239E, TC331E, TC334E;) SA226- T(B) (S/N T(B)276, T(B)292 thru T(B)417, T(B)303E); SA227-AC (S/N AC406, AC415, AC416, AC420 thru AC601, AC603); SA227-TT (S/N TT421 thru TT535, TT537 thru TT541); SA227-AT (S/N AT423 thru AT526, AT528, AT530 thru AT535, AT537 thru AT585) airplanes certificated in any category. Compliance: Required within the next 100 hours time-in-service after the effective date of this AD unless previously accomplished in accordance with AD 85-22-06, Amendment 39-5158, and thereafter as indicated below, at thenext scheduled interval. To assure proper operation of the Stall Avoidance System (SAS), accomplish the following: (a) Except as noted in paragraph (b) of this AD, modify and/or inspect the applicable airplanes in accordance with the manufacturer's service bulletins, at the initial and repetitive time- in-service intervals, as specified for the model and serial numbered airplanes, set forth in Table 1 below: Table 1 When performing a functional check of the SAS Servo (Bendix only) allow the servo to run for a minimum of 5 minutes prior to accomplishing the functional check. If the temperature is below 0oC, allow the servo (Bendix only) to run for a minimum of 10 minutes prior to accomplishing the functional check. Model Serial Number Fairchild Service Bulletin Compliance Interval Hrs-Time in Service SA226-T T201 thru T275 226-A27-024 one time only T277 thru T291 226-A27-028 one time only 226-27-038 Para. 2.A 200 Para. 2.B 500 Para. 2.C. 500 Para. 2.D. 800 SA226-AT AT001 thru AT073, 226-A27-024 one time only AT003E, AT038E, AT062E, AT064E 226-27-038 Para. 2.A 200 Para. 2.B 500 Para. 2.C. 500 Para. 2.D. 800 AT074 thru AT419 226-27-038 Para. 2.A 200 Para. 2.B 500 Para. 2.C. 500 Para. 2.D. 800 SA226-TC TC201 thru TC314, 226-A27-024 one time only TC208E, TC211E, TC211EE, TC211EEE, 226-27-038 TC211EEEE, TC222E Para. 2.A 200 TC227E, TC228E Para. 2.B 500 TC229E, TC234E, Para. 2.C. 500 TC237E, TC238E Para. 2.D. 800 TC239E TC315 thru TC419 226-27-038 TC331E, TC334E Para. 2.A 200 Para. 2.B 500 Para. 2.C. 500 Para. 2.D. 800 SA226-T(B) T(B)276, 226-A27-028 one time only T(B)292 thru 226-A27-033 one time only T(B)391 226-27-037 Para. 2.A 200 Para. 2.B 500 Para. 2.C. 2000 T(B)392 thru 226-27-033 one time only T(B)417, 226-27-037 T(B)303E Para. 2.A 200 Para. 2.B 500 Para. 2.C. 2000 SA227-AC AC420 thru AC551 227-A27-004 one time only 227-27-006 Para. 2.A 200 Para. 2.B 500 Para. 2.C. 2000 AC406, AC415, 227-27-006 AC416, AC552 thru Para. 2.A 200 AC601, AC603 Para. 2.B 500 Para. 2.C. 2000 SA227-TT TT421, thru TT526, 227-A27-004 one time only TT528, TT530 thru 227-27-006 TT535 Para. 2.A 200 Para. 2.B 500 Para. 2.C. 2000 TT527, TT529, 227-27-004 one time only TT536 thru TT541 SA227-AT AT423 thru AT526 227-A27-004 one time only AT528, AT530 thru 227-27-006 AT535, AT537 thru Para. 2.A 200 AT549 Para. 2.B 500 Para. 2.C. 2000 AT550 thru AT585 227-27-006Para. 2.A 200 Para. 2.B 500 Para. 2.C. 2000 (b) Modify and/or inspect those Model SA226 and SA227 series airplanes which are equipped with the Conrac SAS system (per STC SA4725SW) in accordance with Table 2 as follows: Table 2 When performing a functional check of the SAS Servo (Bendix only) allow the servo to run for a minimum of 5 minutes prior to accomplishing the functional check. If the temperature is below 0oC, allow the servo (Bendix only) to run for a minimum of 10 minutes prior to accomplishing the functional check. Model Serial Number Fairchild Service Bulletin Compliance Interval Hrs-Time in Service 226-27-037 Para. 2.A 200 Para. 2.B 500 Any applicable Model SA226 and SA227 airplanes incorporating STC SA4725SW Para. 2.C 2000 NOTE 1: The current issue date and subject matter of the Service Bulletins specified in Table 1 are as follows: (1) 226-A27-024 - "Flight controls - Elevator," dated 11/13/79. (2) 226-A27-028 - "Flight controls - Rudder and Elevator," dated 12/11/80. (3) 226-A27-033 - "Flight controls - Elevator," dated 12/3/82, revised 1/6/83. (4) 227-A27-004 - "Flight controls - Elevators," dated 12/3/82, revised 1/6/83. (5) 226-27-037 - "Conrac SAS System - Inspection and Recalibration," dated 2/15/85, revised 4/15/88. (6) 226-27-038 - "Rosemount SAS System - Inspection and Recalibration," dated 2/15/85, revised 1/16/90. (7) 227-27-006 - "Conrac SAS System - Inspection and Recalibrations," dated 2/15/85, revised 4/15/88. (c) If the inspections specified in paragraphs (a) and (b) of this AD necessitate replacement of the servo pusher, assure that the replacement unit is either new, overhauled, or meets the limits of the electrical test specified in the above revised service bulletins. (d) Airplanes may be flown in accordance with FAR 21.197 to a location where this AD may be accomplished. (e) 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, Airplane Certification Office, Fort Worth, Texas 76193-0150; Telephone (817) 624-5150. NOTE 2: The request should be forwarded through an FAA Maintenance Inspector, who may add comments and then send it to the Manager, Airplane Certification Office, Fort Worth, Texas. All persons affected by this directive may obtain copies of the documents referred to herein upon request to the Fairchild Aircraft Corporation, P.O. Box 790490, San Antonio, Texas 78279- 0490; or may examine these documents at the FAA, Central Region, Room 1558, 601 East 12th Street, Kansas City, Missouri 64106. Airworthiness Directive 85-22-06 R1 revises AD 85-22-06, Amendment 39-5158. This amendment (39-6675, AD 85-22-06 R1) becomes effective on October 19, 1990. ## 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/85-22-06-R1/models.md Every aircraft: https://openairdocs.org/ad/85-22-06-R1/aircraft.md ## Related documents - [STC SA4725SW](https://openairdocs.org/stc/SA4725SW): Installation of Conrac stall warning and stall avoidance system.. Ontic Engineering and Manufacturing Inc., Cited in the text --- 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.