# AD 80-20-06: KFC-200 Flight Control System Modification Under STC SA1246CE

- Type: Airworthiness directive
- Status: Current
- Products: Cessna 421C with STC SA1246CE
- Effective: October 14, 1980
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-3937
- Registered aircraft: 496 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/E52B7D5A5A1C6893862569B9004D346B.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/80-20-06

## The airworthiness directive

80-20-06 CESSNA: Amendment 39-3937. Applies to Model 421C airplanes (Serial Number 421C0401 and on) having King KFC-200 Flight Control System installed under Supplemental Type Certificate SA1246CE.

COMPLIANCE: Required as indicated unless already accomplished.

To prevent the airplane from exceeding 60 degrees bank angle in the event of a roll axis hard-over malfunction, accomplish the following:

A) Within the next 25 hours time-in-service after the effective date of this AD, reset the KFC-200 roll axis slip clutch from 60 plus or minus 6 inch-pounds to 38 plus or minus 4 inch-pounds in accordance with the instructions contained in King Radio Service Sales Installation Bulletin No. 167 dated August 4, 1980.

B) Airplanes may be flown in accordance with FAR 21.197 to a location where the maintenance required by this AD may be performed provided the autopilot is inoperative.

C) Any equivalent method of compliance must be approved by the Chief, Aircraft Certification Program, Federal Aviation Administration, Room 238, Terminal Building No. 2299, Mid-Continent Airport, Wichita, Kansas 67209.

This amendment becomes effective October 14, 1980.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A7CE](https://openairdocs.org/tcds/A7CE): Textron Aviation Inc.; names 1 of 16 models: 421C

## 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: 496 (496 by airframe model, 0 by engine model)
- Makers: Cessna 496

Models with the most aircraft:

- [Cessna 421C](https://openairdocs.org/model/cessna-421c): 496 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/80-20-06/models.md
Every aircraft: https://openairdocs.org/ad/80-20-06/aircraft.md

## Related documents

- [STC SA1246CE](https://openairdocs.org/stc/SA1246CE): Installation of King KFC-200 2 axis (3 optional) flight control system with a KI-255 (or -256) flight command indicator or a KG-258 Attitude Horizon Gyro with a KC-292 Mode Controller.. Honeywell International Inc, Named in the applicability

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