- Effective
- February 26, 1976
- Models
- 172L, 172M, 177B, 177RG, 180H, 180J and 40 more
- Registered aircraft
- 13,336 matched by model
- Product
- Aircraft · Small airplane
- Amendment
- 39-2519
Unofficial copy of the text in the FAA’s Dynamic Regulatory System. The FAA’s own copy is the authoritative one. DRS record last changed May 30, 2024.
Copies of the files this page was built from, with their SHA-256. Retrieved October 18, 2026.
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On this page
The airworthiness directive
76-04-03 CESSNA: Amendment 39-2519. Applies to the airplane models and serial numbers listed below which have ARC PA-500A actuators (Serial Numbers 6265 and below) installed as part of Cessna Model 300, 400 and 400A autopilots, 300, 400 or 800 IFCS, or in Type G-830A yaw damper systems.
MODELS SERIAL NUMBERS 172L, M 17259287 thru 17263458 F172K, L, M F1720780 thru F1721234 FR172H, J FR1720240 thru FR1720530 177B 17701576 thru 17702123 177RG 177RG0001 thru 177RG0592 F177RG F177RG0001 thru F177RG0122 180H, J 18052170 thru 18052500 182N, P 18260460 thru 18263475 A185E, F 18501815 thru 18502565 P206E; TP206E P20600626 thru P20600647 U206E, F; TU206E, F U20601447 thru U20603093 207, T207 20700149 thru 20700314 210K, L & T210K, L 21059200 thru 21061040 310Q, T310Q 310Q0001 thru 310Q1160 310R, T310R 310R0001 thru 310R0330 337E, F, G; T337E, F 33701290 thru 33701673 F337E, F, G F3370020 thru F3370071 T337G P3370001 thru P3370225 F337GP FP3370001 thru FP3370015 340 3400001 thru 3400555 401B 401B0001 thru 401B0221 402B 402B0001 thru 402B0935 414 4140001 thru 4140655 421B 421B0001 thru 421B0970
Compliance: Required as indicated, unless already accomplished.
To preclude restrictions of control movement due to jamming of the ARC PA-500A actuator gear train, accomplish the following:
A) Until Paragraph B is accomplished, within 100 hours' time in service after the effective date of this AD and thereafter at intervals not to exceed 100 hours' time in service, inspect the ARC PA-500A actuator(s) in accordance with Cessna Service letter AV75-10, dated December 19, 1975, or later approved revisions, which service letter incorporates ARC Field Engineering Service Bulletin No. 181. Correct any unsafe condition noted by adjustment replacement of parts as necessary.
B) Within twelve months of the effective date of this AD, modify the ARC Model PA-500A actuator(s) in accordance with Cessna Service Letter No. AV75-10 dated December 19, 1975, or later approved revisions, which service letter incorporation ARC Field Engineering Service Bulletin No. 181.
C) Any alternate method of compliance with this AD must be approved by the Chief, Engineering and Manufacturing Branch, FAA, Central Region.
This amendment becomes effective February 26, 1976.
Affected TCDS · 17
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 13,336
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1943 | 2 |
|---|---|
| 1964 | 15 |
| 1965 | 61 |
| 1966 | 98 |
| 1967 | 65 |
| 1968 | 47 |
| 1969 | 252 |
| 1970 | 576 |
| 1971 | 782 |
| 1972 | 1,202 |
| 1973 | 1,822 |
| 1974 | 1,752 |
| 1975 | 2,155 |
| 1976 | 1,729 |
| 1977 | 383 |
| 1978 | 226 |
| 1979 | 157 |
| 1980 | 94 |
| 1981 | 99 |
| 1982 | 26 |
| 1983 | 14 |
| 1984 | 5 |
| 1985 | 14 |
| 1986 | 1 |
| 1990 | 1 |
| 1993 | 2 |
1,756 with no year recorded