# AD 68-14-01: Pneumatic Deicer System

- Type: Airworthiness directive
- Status: Current
- Products: Textron 56TC, D55 and E95
- Effective: July 10, 1968
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-618
- Registered aircraft: 162 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/2F8BB68435FF180E86256A08006C47DF.0001
- DRS record last changed: January 21, 2026
- Page: https://openairdocs.org/ad/68-14-01

## The airworthiness directive

68-14-01 BEECH: Amendment 39-618. Applies to Model D55, 56TC and E95 airplanes equipped with Beechcraft pneumatic deicer system and Beechcraft Model B5 Autopilot (manufactured as Brittain Model B-5P).

Compliance required as indicated.

An unsafe condition exists wherein the simultaneous operation of the Model B5 Autopilot and the pneumatic de-icer system might cause the airplane to exceed the structural limits. Since a potential unsafe condition exists, the following operating limitations are prescribed for all affected aircraft:

A. Aircraft must not be operated with Beechcraft Model B5 Autopilot and Beechcraft pneumatic de-icer system operating simultaneously.

B. Within the next ten hours time in service after receipt of the telegram a placard must be installed in clear view of the pilot near the autopilot controller stating as follows: "Autopilot must be turned OFF whenever the de-icer system is ON."

C. Placard is to remain installed in aircraft until such time as Brittain Industries, Inc., Service Bulletin No. 68-1, Revision A, or a satisfactory equivalent modification approved by the Chief, Aircraft Engineering Division, FAA, Western Region, has been accomplished and incorporated into the autopilot system.

This amendment becomes effective on July 10, 1968, for all persons except those to whom it was made effective immediately by telegram dated May 29, 1968.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 3A16](https://openairdocs.org/tcds/3A16): Textron Aviation Inc.; names 3 of 21 models: D55, E95, 56TC

## 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: 162 (162 by airframe model, 0 by engine model)
- Makers: Beech 162

Models with the most aircraft:

- [Beech D55](https://openairdocs.org/model/beech-d55): 119 aircraft (airframe model)
- [Beech 56TC](https://openairdocs.org/model/beech-56tc): 37 aircraft (airframe model)
- [Beech E95](https://openairdocs.org/model/beech-e95): 6 aircraft (airframe model)

All 3 models: https://openairdocs.org/ad/68-14-01/models.md
Every aircraft: https://openairdocs.org/ad/68-14-01/aircraft.md

Its text cites no advisory circulars or STCs.

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