- Effective
- January 29, 1985
- Published
- December 19, 1984
- Issued
- December 11, 1984
- Model
- Paper Induction Air Filters
- Product
- Appliance · Small airplane
- Amendment
- 39-4966
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 November 21, 2025.
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 | 21 KB | 289089fe…cdaaff7 | FAA DRS (API key needed) |
On this page
The airworthiness directive
84-26-02 INDUCTION AIR FILTERS: Amendment 39-4966. Applies to all paper induction air filters used in small airplanes.
Compliance: Required as indicated, unless already accomplished.
To prevent possible engine power loss or stoppage caused by engine ingestion of fragments of a deteriorated induction air filter, accomplish the following:
Within the next one hundred hours time-in-service after the effective date of this AD or prior to the accumulation of 500 hours time-in-service on the filter, whichever occurs later, and thereafter at intervals not exceeding 500 hours time-in-service on the filter:
(a) Replace the air filter with a new filter that is FAA approved for the airplane installation.
(b) Within 100 hours time-in-service replace any filter on which the time-in-service cannot be determined utilizing the airplane maintenance records for this determination. NOTE: This AD does not alter current maintenance procedures which require inspection of paper induction air filters at 100 hours time-in-service and annual inspections and replacement as necessary based on filter condition.
This amendment becomes effective January 29, 1985.
Registered aircraft
NTSB investigations that cite this AD · 1
Their narratives or probable cause name AD 84-26-02, often to say whether the aircraft complied with it.