# AD 77-18-04: Cabin Pressurization

- Type: Airworthiness directive
- Status: Current
- Products: Textron 200, 200T, A100, B100, C90 and E90
- Effective: September 12, 1977
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small/large airplane
- Amendment: 39-3028
- Registered aircraft: 677 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/F7DA25CB85CAD1B3862569850046DEB7.0001
- DRS record last changed: January 21, 2026
- Page: https://openairdocs.org/ad/77-18-04

## The airworthiness directive

77-18-04 BEECH: Amendment 39-3028. Applies to Models C90 (serial numbers LJ-689 through LJ-713), E90 (serial numbers LW-167 through LW-216), A100 (serial numbers B-213 through B-232), B100 (serial numbers BE-10 through BE-22), Model 200 (serial numbers BB- 175 through BB-185, BB-187 through BB-193, BB-195 through BB-198, BB-200 through BB- 202, and BB-204 through BB-223), and Model 200T (serial numbers BT-1 and BT-2) airplane certificated in all categories.

Compliance: Required as indicated unless already accomplished.

To assure proper locking of the cabin door and to prevent possible incidents involving loss of cabin pressurization, within the next 25 hours time-in-service after the effective date of this AD, accomplish the following in accordance with Beechcraft Service Instructions No. 0914 or later approved revisions and instructions contained in the applicable airplane maintenance manual:

A. Visually inspect the cabin door latch hooks and pins for proper engagement and adjustment, check the door latch mechanism for over center position when locked, and adjust latch hooks, pins and/or door latch mechanism if necessary.

B. Any equivalent means of compliance with this AD must be approved by the Chief, Engineering and Manufacturing Branch, FAA, Central Region.

This amendment becomes effective on September 12, 1977.

## Affected data sheets (3) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 3A20](https://openairdocs.org/tcds/3A20): Textron Aviation Inc.; names 2 of 22 models: E90, C90
- [TCDS A14CE](https://openairdocs.org/tcds/A14CE): Textron Aviation Inc.; names 2 of 12 models: B100, A100
- [TCDS A24CE](https://openairdocs.org/tcds/A24CE): Textron Aviation Inc.; names 2 of 37 models: 200, 200T

## 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: 677 (677 by airframe model, 0 by engine model)
- Makers: Beech 676, Raytheon 1

Models with the most aircraft:

- [Beech 200](https://openairdocs.org/model/beech-200): 234 aircraft (airframe model)
- [Beech C90](https://openairdocs.org/model/beech-c90): 216 aircraft (airframe model)
- [Beech E-90](https://openairdocs.org/model/beech-e-90): 145 aircraft (airframe model)
- [Beech B100](https://openairdocs.org/model/beech-b100): 58 aircraft (airframe model)
- [Beech A100](https://openairdocs.org/model/beech-a100): 15 aircraft (airframe model)
- [Beech 200T](https://openairdocs.org/model/beech-200t): 8 aircraft (airframe model)
- [Raytheon E90](https://openairdocs.org/model/raytheon-e90): 1 aircraft (airframe model)

All 7 models: https://openairdocs.org/ad/77-18-04/models.md
Every aircraft: https://openairdocs.org/ad/77-18-04/aircraft.md

Its text cites no advisory circulars or STCs.

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