81-23-07: Engine Mount Assembly
FAA order 81-23-07 is an airworthiness directive in force since November 16, 1981. The FAA's subject line: Engine Mount Assembly. It names Piper PA-38 Tomahawk: about 442 aircraft on the U.S. register today, though an order usually covers particular versions or serial numbers rather than every one. System: engine.
What it applies to as the FAA lists it
- Kind of product
- Aircraft
- Makes
- Piper Aircraft Inc.
- Models
- PA-38-112
- On this site
- Piper PA-38 Tomahawk 442 registered
Dates and paperwork
- In force since
- November 16, 1981
- Published
- November 9, 1981 (signed October 29, 1981)
- Docket
- Unknown
- Status
- Current
- The FAA's document
- Read the order on the FAA's site
The order itself the regulatory text, as published
Show the full text (2,145 characters)
81-23-07 PIPER: Amendment 39-4252. Applies to Model PA-38-112 Serial Nos. 38-78A0001 thru 38-78A0678 certificated in all categories except aircraft incorporating engine mount assembly Piper Part Number 77651-02.
To prevent possible nose-gear failure associated with weakening of the engine-mount, accomplish the following unless previously accomplished:
a. On aircraft modified in accordance with Piper S/B 617 dated October 12, 1978, or equivalent, with less than 950 hours in service since incorporation of the modification, inspect and replace, if required, the engine mount within the next 50 hours in service after the effective date of this AD, in accordance with Piper S/B 617B dated January 13, 1981, Instructions Paragraph 3 or equivalent. Repeat inspection at intervals not to exceed 50 hours until 1000 hours in service from modification or until replacement of the engine mount with engine mount assembly Piper Part Number 77651-02. Replacement engine mount P/N 77651-02must be installed prior to the accumulation of 1000 hours in service on modified engine mount.
b. On aircraft modified in accordance with Piper S/B 617 dated October 12, 1978, or equivalent, with 950 or more hours in service since the modification, within the next 50 hours in service after the effective date of this AD, replace the engine mount with engine mount assembly Piper Part No. 77651-02.
c. On aircraft which have not been modified in accordance with Piper S/B 617, dated October 12, 1978, within the next 50 hours in service after the effective date of this AD, replace the engine mount with engine mount assembly Piper Part No. 77651-02.
d. Alternative inspections and alterations which provide an equivalent level of safety may be used when approved by the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region.
e. Upon submission of substantiating data through an FAA Maintenance Inspector, the compliance times specified in this AD may be adjusted by the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region.
This amendment supersedes AD 79-01-07.
This amendment is effective November 16, 1981.
Source: FAA Dynamic Regulatory System, airworthiness directives. The FAA's document is the authority; the register counts are this site's, from the FAA register of November 6, 2026. Connections as data: /graph/directive/81-23-07.json · aircraft systems.