# AD 91-20-08: Fresh Air Blower Housing - Type: Airworthiness directive - Status: Current - Products: Textron A36, A36TC, B36TC, F33A, F33C and V35B - Effective: October 31, 1991 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Small airplane - Amendment: 39-8042 - Docket: 91-CE-13-AD - Registered aircraft: 4,745 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/7642DC67AAF3E0FC86256A09005CAA8F.0001 - DRS record last changed: January 21, 2026 - Page: https://openairdocs.org/ad/91-20-08 ## The airworthiness directive 91-20-08 BEECH: Amendment 39-8042. Docket No. 91-CE-13-AD. Applicability: The following model and serial number airplanes that are equipped with an optional fresh air blower, certificated in any category: Model Serial Numbers F33A CE-941 through CE-1555 F33C CJ-156 through CJ-179 V35B D-10348, and D-10364 through D- 10403 A36 E-1809 through E-2592 A36TC and B36TC EA-192 through EA-514 Compliance: Required within the next 50 hours time-in-service after the effective date of this AD, unless already accomplished. To prevent fresh air blower housing failure, which could lead to blower impingement on the flight control cables located below the blower and possible loss of control of the airplane, accomplish the following: (a) Inspect and modify as required the attachment of the fresh air blower housing in accordance with the instructions and the criteria contained in Beech Service Bulletin No. 2380, revised April 1991. (b) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a location where the requirements of this AD can be accomplished. (c) An alternative method of compliance or adjustment of the compliance time that provides an equivalent level of safety may be approved by the Manager, Wichita Aircraft Certification Office, FAA, 1801 Airport Road, Mid-Continent Airport, Wichita, Kansas 67209. The request should be forwarded through an appropriate FAA Maintenance Inspector, who may add comments and then send it to the Manager, Wichita Aircraft Certification Office. (d) The inspection and modification required by this AD shall be done in accordance with Beech Service Bulletin No. 2380, revised April 1991. 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 the Beech Aircraft Corporation, P.O. Box 85, Wichita, Kansas 67201-0085. 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, 1100 L Street, NW, Room 8401, Washington, DC. This amendment (39-8042, AD 91-20-08) becomes effective on October 31, 1991. ## Affected data sheets (1) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS 3A15](https://openairdocs.org/tcds/3A15): Textron Aviation Inc.; names 6 of 27 models: V35B, B36TC, A36, F33A, A36TC, F33C ## 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: 4,745 (4,745 by airframe model, 0 by engine model) - Makers: Beech 4,214, Raytheon 530, Beech/Goedkerj L 1 Models with the most aircraft: - [Beech A36](https://openairdocs.org/model/beech-a36): 1,907 aircraft (airframe model) - [Beech F33A](https://openairdocs.org/model/beech-f33a): 978 aircraft (airframe model) - [Beech V35B](https://openairdocs.org/model/beech-v35b): 913 aircraft (airframe model) - [Raytheon A36](https://openairdocs.org/model/raytheon-a36): 448 aircraft (airframe model) - [Beech B36TC](https://openairdocs.org/model/beech-b36tc): 225 aircraft (airframe model) - [Beech A36TC](https://openairdocs.org/model/beech-a36tc): 174 aircraft (airframe model) - [Raytheon B36TC](https://openairdocs.org/model/raytheon-b36tc): 82 aircraft (airframe model) - [Beech F33C](https://openairdocs.org/model/beech-f33c): 17 aircraft (airframe model) - [Beech/Goedkerj L A36](https://openairdocs.org/model/beech-goedkerj-l-a36): 1 aircraft (airframe model) All 12 models: https://openairdocs.org/ad/91-20-08/models.md Every aircraft: https://openairdocs.org/ad/91-20-08/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.