# AD 66-02-01: Air Conditioners - Type: Airworthiness directive - Status: Current - Products: Beechcraft 56TC, 58, 58A, 65, 65-80, 65-88, 65-90, 65-A80, 65-A80-8800, 65-A90, 65-A90-1, 65-A90-2 and 30 more - Effective: February 10, 1966 - Superseded by: Nothing supersedes this AD - Product type: Appliance - Amendment: 39-179 - Registered aircraft: 1,601 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/E6EB5DCED92C91DF86256A320056E3CC.0001 - DRS record last changed: January 21, 2026 - Page: https://openairdocs.org/ad/66-02-01 ## The airworthiness directive 66-02-01 BEECHCRAFT: Amendment 39-179 Part 39 Federal Register January 8, 1966. Applies to all Airplanes Equipped with Model BAK-109 Air Conditioners. Compliance required within the next 100 hours' time in service after the effective date of this AD unless already accomplished. To prevent further failures of the compressor motor fan, replace the fan in accordance with Beech Service Bulletin No. 65-4 dated March 1965. NOTE: The Beechcraft Model BAK-109 Air Conditioner is known to be installed in, but not limited to, Beech Models 18, 50, 65 Series; Douglas Model DC3; Lockheed Model 18; Viscount Models 744, 745D and 810 Series airplanes. This directive effective February 10, 1966. ## Affected data sheets (11) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS 3A20](https://openairdocs.org/tcds/3A20): Textron Aviation Inc.; names 12 of 22 models: 65-A80-8800, 65-A90-2, 65-A90-1, 65-B80, 65-A80, 65-A90-3, 65, 65-88… - [TCDS A-669](https://openairdocs.org/tcds/A-669): The Boeing Company; names 10 of 10 models: DC3C-S4C4G, DC3C-R-1830-90C, DC3A-S1C3G, DC3C-SC3G, DC3C-S1C3G, DC3A-SCG, DC3A-SC3G, DC3A-S1CG… - [TCDS A-618](https://openairdocs.org/tcds/A-618): The Boeing Company; names 4 of 4 models: DC3-G202A, DC3-G102A, DC3-G103A, DC3-G102 - [TCDS A23CE](https://openairdocs.org/tcds/A23CE): Textron Aviation Inc.; names 4 of 4 models: 58TC, 58P, 58TCA, 58PA - [TCDS 3A16](https://openairdocs.org/tcds/3A16): Textron Aviation Inc.; names 3 of 21 models: 58, 58A, 56TC - [TCDS A-814](https://openairdocs.org/tcds/A-814): Vickers-Armstrongs (Aircraft Limited); names 3 of 3 models: Viscount 810, Viscount 744, Viscount 745D - [TCDS 5A4](https://openairdocs.org/tcds/5A4): Textron Aviation Inc.; names 1 of 14 models: 50 - [TCDS A-684](https://openairdocs.org/tcds/A-684): Textron Aviation Inc.; names 1 of 6 models: 18D - [TCDS A-723](https://openairdocs.org/tcds/A-723): Lockheed Martin Aeronautics Company; names 1 of 1 models: 18 - [TCDS TC 630](https://openairdocs.org/tcds/TC%20630): Textron Aviation Inc.; names 1 of 2 models: 18A - [TCDS TC 710](https://openairdocs.org/tcds/TC%20710): Textron Aviation Inc.; names 1 of 2 models: 18S (Army C-45C) ## 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: 1,601 (1,601 by airframe model, 0 by engine model) - Makers: Beech 1,349, Raytheon 188, Douglas 61, Lockheed 2, Rockwell International 1 Models with the most aircraft: - [Beech 58](https://openairdocs.org/model/beech-58): 726 aircraft (airframe model) - [Beech 58P](https://openairdocs.org/model/beech-58p): 298 aircraft (airframe model) - [Raytheon 58](https://openairdocs.org/model/raytheon-58): 188 aircraft (airframe model) - [Beech 65-A90-1](https://openairdocs.org/model/beech-65-a90-1): 90 aircraft (airframe model) - [Beech 58TC](https://openairdocs.org/model/beech-58tc): 79 aircraft (airframe model) - [Beech 56TC](https://openairdocs.org/model/beech-56tc): 37 aircraft (airframe model) - [Beech 65-A90](https://openairdocs.org/model/beech-65-a90): 34 aircraft (airframe model) - [Douglas DC3C-S1C3G](https://openairdocs.org/model/douglas-dc3c-s1c3g): 30 aircraft (airframe model) - [Beech 65](https://openairdocs.org/model/beech-65): 22 aircraft (airframe model) - [Beech 65-B80](https://openairdocs.org/model/beech-65-b80): 15 aircraft (airframe model) - [Beech 65-A90-4](https://openairdocs.org/model/beech-65-a90-4): 13 aircraft (airframe model) - [Douglas DC3C-R-1830-90C](https://openairdocs.org/model/douglas-dc3c-r-1830-90c): 10 aircraft (airframe model) - [Beech 65-90](https://openairdocs.org/model/beech-65-90): 7 aircraft (airframe model) - [Douglas DC3-G202A](https://openairdocs.org/model/douglas-dc3-g202a): 7 aircraft (airframe model) - [Beech 65 (LF-23F)](https://openairdocs.org/model/beech-65-lf-23f): 6 aircraft (airframe model) - [Douglas DC-3A-S1C3G](https://openairdocs.org/model/douglas-dc-3a-s1c3g): 5 aircraft (airframe model) - [Douglas DC3C-S4C4G](https://openairdocs.org/model/douglas-dc3c-s4c4g): 5 aircraft (airframe model) - [Beech 58PA](https://openairdocs.org/model/beech-58pa): 3 aircraft (airframe model) - [Beech 65-A80](https://openairdocs.org/model/beech-65-a80): 3 aircraft (airframe model) - [Beech 65-88](https://openairdocs.org/model/beech-65-88): 3 aircraft (airframe model) All 34 models: https://openairdocs.org/ad/66-02-01/models.md Every aircraft: https://openairdocs.org/ad/66-02-01/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.