- Effective
- April 22, 1980
- Model
- Carburetor Air Inlet Filter
- Product
- Appliance
- Amendment
- 39-3745
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 | 21 KB | db4416cf…19b4e89 | FAA DRS (API key needed) |
On this page
The airworthiness directive
80-08-14 PURE-AIR, INC.: Amendment 39-3745. Applies to all aircraft using the Pure-Air, Inc. carburetor air inlet filter installed per STC SA69NW.
Compliance is required as indicated.
A. Within 60 days from the effective date of this AD, unless already accomplished.
1. Remove Pure-Air filter foam elements which have been installed for more than 100 hours time in service or one year, whichever occurs first, and install screen (PN M-117 Large or PN M-118 Small) on the downstream inside surface of the filter box (PN M-102 Large or PN M-101 Small) by means of the filter attach bolts.
2. Replace each Pure-Air filter element which has accumulated either 100 hours or one year in service with a new filter element.
B. Replace the foam filter element:
1. Every 100 hours time in service or 12 calendar months, whichever comes first.
2. Any time the filter element becomes 50% covered with any foreign material.
C. Install the new Pure-Air supplies decal, which reflects the above replacement times, in plain view on the upper right hand outside surface of the filter box.
This amendment becomes effective April 22, 1980.