- Effective
- October 3, 1973
- Model
- R172E
- Data sheet
- TCDS3A17
- Registered aircraft
- 98 matched by model
- Product
- Aircraft · Small airplane
- Amendment
- 39-1726
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.
| File | Size | SHA-256 | Original |
|---|---|---|---|
| FAA DRS HTML | 19 KB | 3e82efa4…49d5667 | FAA DRS (API key needed) |
On this page
The airworthiness directive
73-20-04 CESSNA: Amendment 39-1726. Applies to Model R172E (T-41B) Serial Numbers R172-0001 through R172-0256) airplanes.
Compliance: Within 50 hours' time in service after the effective date of this AD, unless already accomplished.
To prevent complete loss of engine power when using the fuel boost pump, accomplish the following:
Modify the fuel boost pump electrical circuit by installing a new boost pump switch, electrical resistors, and placard in accordance with Cessna Service Letter No. SE73-24, dated August 24, 1973, and Service Kit SK172-43, or later FAA-approved revisions, or any equivalent method approved by the Chief, Engineering and Manufacturing Branch, FAA, Central Region.
This amendment becomes effective October 3, 1973.
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 98
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1966 | 10 |
|---|---|
| 1967 | 45 |
| 1968 | 9 |
| 1971 | 1 |
| 1974 | 1 |
32 with no year recorded