# AD 80-09-09: Dual Flight Director Installation

- Type: Airworthiness directive
- Status: Current
- Products: Cessna 500, 501, 550 and 551
- Effective: May 12, 1980
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small/large airplane
- Amendment: 39-3768
- Registered aircraft: 785 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/79C5DB5E61DD56ED862569EB0065C3FA.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/80-09-09

## The airworthiness directive

80-09-09 CESSNA: Amendment 39-3768. Applies to the following airplanes, equipped with Cessna installed dual flight director indicators, unless modified to provide independent power sources, distribution and bus systems for the dual flight director installation or by relocating the copilot's second attitude indicator to the top center position of the copilot panel instrument "T".

Serial Numbers

500-0066 500-0303

500-0178 500-0304

500-0184 500-0342

500-0275 500-0343

500-0276 500-0344

500-0278 500-0346

500-0279 500-0359

500-0292 500-0364

500-0293 500-0371

500-0294 500-0370

500-0299 500-0373

500-0300 500-0379 Model 500

Serial Numbers

501-0016 501-0063

501-0024 501-0066

501-0027 501-0067

501-0034 501-0112

501-0052 501-0121 Model 501

Serial Numbers

550-0005 550-0079

550-0010 550-0091

550-0012 550-0095

550-0025 550-0098

550-0032 550-0100

550-0034 550-0106

550-0038 550-0110

550-0044 550-0114

550-0046 550-0116

550-0047 550-0121

550-0056 550-0124

550-0062 550-0126

550-0063 550-0130

550-0064 550-0134

550-0066 550-0136

550-0067 550-0138

550-0069 550-0141

550-0073 550-0152

550-0076

Model 550

Serial Numbers

551-0016

551-0024

Model 551 551-0061

COMPLIANCE: Required as indicated, unless previously accomplished.

To preclude the loss of attitude information to the crew, within the next 100 hours time-in-service after the effective date of this AD, accomplish the following:

A) Insert the following information in the applicable FAA Approved Airplane Flight Manual, Section II, Operating Limitations, under the heading Dual Flight Director Installation and operate the airplane in accordance with this insertion:

"The copilot's second attitude indicating system must be installed, operational, and remain operating throughout theflight for those airplanes equipped with the Dual Flight Director Installation."

B) Relocate the copilot's second attitude indicator from the center instrument panel or right side instrument panel if applicable to one of the following positions on the copilot instrument panel.

1) Two instrument positions below the copilot airspeed indicator, or

2) One instrument position below the copilot's altimeter, or

3) Two instrument positions below the copilot's altimeter.

C) Use Paragraph A of this AD or a duplicate thereof, as an amendment to the FAA Approved Airplane Flight Manual until replaced by the following applicable FAA Approved Cessna revision:

Model Revision No. FAA Approved Date 500 43 April 15, 1980 501 13 April 18, 1980 550 13 April 15, 1980 551 10 April 18, 1980

D) Any equivalent method of compliance with this Airworthiness Directive must be approved by the Chief, Wichita Engineering and Manufacturing District Office, Federal Aviation Administration, Room 238, Terminal Building No. 2299, Mid-Continent Airport, Wichita, Kansas 67209.

This amendment becomes effective May 12, 1980.

## Affected data sheets (2) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A22CE](https://openairdocs.org/tcds/A22CE): Textron Aviation Inc.; names 2 of 6 models: 550, 500
- [TCDS A27CE](https://openairdocs.org/tcds/A27CE): Textron Aviation Inc.; names 2 of 2 models: 551, 501

## 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: 785 (785 by airframe model, 0 by engine model)
- Makers: Cessna 785

Models with the most aircraft:

- [Cessna 550](https://openairdocs.org/model/cessna-550): 500 aircraft (airframe model)
- [Cessna 501](https://openairdocs.org/model/cessna-501): 189 aircraft (airframe model)
- [Cessna 500](https://openairdocs.org/model/cessna-500): 62 aircraft (airframe model)
- [Cessna 551](https://openairdocs.org/model/cessna-551): 34 aircraft (airframe model)

All 4 models: https://openairdocs.org/ad/80-09-09/models.md
Every aircraft: https://openairdocs.org/ad/80-09-09/aircraft.md

Its text cites no advisory circulars or STCs.

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