| AD Number | 78-20-12 | Status | Active |
| Effective Date | October 05, 1978 | Issue Date | Not specified |
| Docket Number | Unknown | Amendment | 39-3312 |
| Product Type | ["Appliance"] | Product Subtype | Not specified |
| CFR Part | --- - Part 39 | CFR Section | N/A |
| Citation | This information is not available. | ||
| Manufacturer(s) | Cessna Aircraft Company Firestone Textron Aviation Inc. Learjet Inc. M7 Aerospace LLC |
| Model(s) | 336 337 T337B T337C T337D T337E T337F T337G T337H T337H-SP Aircraft Tires 200 99 B100 23 24 25 SA226-TC |
78-20-12 FIRESTONE AIRCRAFT TIRES: Amendment 39-3312. Applies to all Firestone size 18x5.5 Mach I, 10 Ply rating part number 00490, serial numbers having the first four numbers 0677, to be replaced by Firestone tire part number 00518 or other approved tire installed on, but not limited to, Lear Jet Models 23, 24, 25; Beech Models 99 series, B100, 200; Swearingen SA 226-TC and Cessna Models 336/337 or T-337 series aircraft.
a) Inspect for serial numbers having the first four numbers 0677 P/N 00490.
b) Replace with Firestone tires having serial numbers outside of this subject group or with Firestone tire P/N 00518 or with any other tire approved for these aircraft.
Obliterate TSO markings on tires identified in this AD to prevent future use on aircraft.
This amendment is effective October 5, 1978, as to all persons except those persons to whom it was made immediately effective by the airmail letter dated September 6, 1978, which contained this amendment.