| AD Number | 77-10-09 | Status | Active |
| Effective Date | May 17, 1977 | Issue Date | May 03, 1977 |
| Docket Number | Unknown | Amendment | 39-2899 |
| Product Type | ["Aircraft"] | Product Subtype | ["Small Airplane"] |
| CFR Part | --- - Part 39 | CFR Section | --- - _EMPTY_ |
| Citation | This information is not available. | ||
| Manufacturer(s) | Piper Aircraft Inc. |
| Model(s) | PA-31-325 |
77-10-09 PIPER: Amendment 39-2899. Applies to PA-31-325.
To prevent possible adverse airplane vibration effects at higher altitudes, accomplish the following within the next 25 hours in service after the effective date of this Airworthiness Directive unless already accomplished:
Attach the following operating limitation placard on the pilot's instrument panel between the clock and airspeed indicator in full view of the pilot: "Above 21,000 feet reduce Vno speed 3 m.p.h. per 1000 feet"
(Piper Service Bulletin No. 544 refers to this subject.)
This amendment becomes effective May 17, 1977.