# AD 75-12-10: Autopilots - Type: Airworthiness directive - Status: Current - Products: M7 Aerospace 60, 95-C55, 95-C55A, A36, A60, B60, D55, D55A, E55, E55A, SA226-AT, SA226-TC and 8 more - Effective: June 11, 1975 - Published: June 5, 1975 - Issued: May 27, 1975 - Superseded by: Nothing supersedes this AD - Product type: Appliance - Amendment: 39-2232 - Registered aircraft: 3,866 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/2F6402E2298EDF1486256A320060AF04.0001 - DRS record last changed: November 21, 2025 - Page: https://openairdocs.org/ad/75-12-10 ## The airworthiness directive 75-12-10 COLLINS: Amendment 39-2232. Applies to Collins AP106 Autopilots which may be installed on Aero Commander Models 500S and 690A; Beech Models 60, A60, B60, 95-C55, 95-C55A, D55, D55A, E55, E55A and A36; DeHavilland Model DHC-6; Piper Models PA 31-350 and PA 31-325; and Swearingen Models SA 226-AT and SA 226-TC, airplanes. Compliance: Required as indicated, unless already accomplished. To prevent failure in multiple servos, accomplish the following: A. Within the next 10 hours" time in service after the effective date of this AD, check the modification information plate on the 161H-1 programmer (P/N 622-1036-001), which is part of the AP106 Autopilot, to determine if the unit has been modified in accordance with Collins Service Bulletin No. 6, or approved revisions. If so modified, make an appropriate entry in the aircraft records indicating compliance with this AD. B. If the 161H-1 programmer has not been modified in accordance with Collins Service Bulletin No. 6, or approved revisions, prior to further flight, disable the roll and pitch servo axes by placing a collar over the circuit breakers, if installed, or remove and tie back the connector from the roll and pitch servos, and in either case install a placard in plain view of the pilot which reads: "DO NOT ENGAGE AUTOPILOT" and operate the aircraft in accordance with this limitation. C. On or before December 1, 1975, modify all the 161H-1 programmers in accordance with Collins Service Bulletin No. 6. D. Any alternate means of compliance with this AD must be approved by the Chief, Engineering and Manufacturing Branch, FAA, Central Region. This amendment becomes effective June 11, 1975, to all persons except those to whom it was made effective earlier by air mail letter issued May 15, 1975. ## Affected data sheets (9) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS 3A16](https://openairdocs.org/tcds/3A16): Textron Aviation Inc.; names 6 of 21 models: 95-C55A, D55, D55A, 95-C55, E55, E55A - [TCDS A9EA](https://openairdocs.org/tcds/A9EA): De Havilland Aircraft of Canada Limited; names 4 of 5 models: DHC-6-1, DHC-6-100, DHC-6-200, DHC-6-300 - [TCDS A12CE](https://openairdocs.org/tcds/A12CE): Textron Aviation Inc.; names 3 of 3 models: A60, B60, 60 - [TCDS A20SO](https://openairdocs.org/tcds/A20SO): Piper Aircraft Inc.; names 2 of 4 models: PA-31-325, PA-31-350 - [TCDS 2A4](https://openairdocs.org/tcds/2A4): Twin Commander Aircraft LLC; names 1 of 21 models: 690A - [TCDS 3A15](https://openairdocs.org/tcds/3A15): Textron Aviation Inc.; names 1 of 27 models: A36 - [TCDS 6A1](https://openairdocs.org/tcds/6A1): Twin Commander Aircraft LLC; names 1 of 9 models: 500S - [TCDS A5SW](https://openairdocs.org/tcds/A5SW): Ontic Engineering and Manufacturing Inc.; names 1 of 7 models: SA226-AT - [TCDS A8SW](https://openairdocs.org/tcds/A8SW): Ontic Engineering and Manufacturing Inc.; names 1 of 4 models: SA226-TC ## 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: 3,866 (3,866 by airframe model, 0 by engine model) - Makers: Beech 2,660, Piper 536, Raytheon 448, Dehavilland 84, Aero Commander 67, Rockwell International 53, Swearingen 11, Dehavilland Acft Of Canada 4, Fairchild 2, Beech/Goedkerj L 1 Models with the most aircraft: - [Beech A36](https://openairdocs.org/model/beech-a36): 1,907 aircraft (airframe model) - [Raytheon A36](https://openairdocs.org/model/raytheon-a36): 448 aircraft (airframe model) - [Piper PA-31-350](https://openairdocs.org/model/piper-pa-31-350): 399 aircraft (airframe model) - [Beech E-55](https://openairdocs.org/model/beech-e-55): 215 aircraft (airframe model) - [Beech B-60](https://openairdocs.org/model/beech-b-60): 186 aircraft (airframe model) - [Beech 95-C55](https://openairdocs.org/model/beech-95-c55): 158 aircraft (airframe model) - [Piper PA-31-325](https://openairdocs.org/model/piper-pa-31-325): 137 aircraft (airframe model) - [Beech D55](https://openairdocs.org/model/beech-d55): 119 aircraft (airframe model) - [Dehavilland DHC-6-300](https://openairdocs.org/model/dehavilland-dhc-6-300): 59 aircraft (airframe model) - [Aero Commander 500 S](https://openairdocs.org/model/aero-commander-500-s): 45 aircraft (airframe model) - [Beech A60](https://openairdocs.org/model/beech-a60): 43 aircraft (airframe model) - [Rockwell International 690A](https://openairdocs.org/model/rockwell-international-690a): 34 aircraft (airframe model) - [Beech 60](https://openairdocs.org/model/beech-60): 32 aircraft (airframe model) - [Aero Commander 690A](https://openairdocs.org/model/aero-commander-690a): 22 aircraft (airframe model) - [Dehavilland DHC-6-200](https://openairdocs.org/model/dehavilland-dhc-6-200): 19 aircraft (airframe model) - [Rockwell International 500-S](https://openairdocs.org/model/rockwell-international-500-s): 19 aircraft (airframe model) - [Swearingen SA226TC](https://openairdocs.org/model/swearingen-sa226tc): 8 aircraft (airframe model) - [Dehavilland DHC-6-100](https://openairdocs.org/model/dehavilland-dhc-6-100): 6 aircraft (airframe model) - [Dehavilland Acft Of Canada DHC 6-300](https://openairdocs.org/model/dehavilland-acft-of-canada-dhc-6-300): 4 aircraft (airframe model) - [Swearingen SA-226AT](https://openairdocs.org/model/swearingen-sa-226at): 3 aircraft (airframe model) All 25 models: https://openairdocs.org/ad/75-12-10/models.md Every aircraft: https://openairdocs.org/ad/75-12-10/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.