# AD 77-01-05: Strobe NAV Light Wire

- Type: Airworthiness directive
- Status: Current
- Products: Piper PA-23-250 and PA-23-250 (Navy UO-1)
- Effective: January 13, 1977
- Published: January 10, 1977
- Issued: December 30, 1976
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-2803
- Registered aircraft: 899 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/4499E79A0DBAFF4A8625699E004A96FD.0001
- DRS record last changed: November 21, 2025
- Page: https://openairdocs.org/ad/77-01-05

## The airworthiness directive

77-01-05 PIPER: Amendment 39-2803. Applies to model PA-23-250 (6 place) Aztec "F", S/Ns 27-7654001 to 27-7654049 inclusive, 27-7654051 to 27-7654099 inclusive, 27- 7654101 to 27-7654116 inclusive, 27-7654118 to 27-7654131 inclusive, 27-7654133 to 27- 7654146 inclusive, 27-7654148 to 27-7654160 inclusive, 27-7654162 to 27-7654164 inclusive, and 27-7654166 to 27-7654171 inclusive.

Compliance required within the next 50 hours' time in service after the effective date of this AD unless already accomplished.

To prevent the hazards associated with the chaffing of the wing tip mounted strobe NAV light wire and the possible electrical arcing to the adjacent wing tip rib, accomplish the following:

  (a) Apply additional insulating material to the applicable electric wiring in accordance with the instructions given in Service Bulletin No. 486, dated October 11, 1976, or with an approved alternate method.

  (b) Upon request with substantiating data submitted through an FAA maintenance inspector, the compliance time specified in this AD may be increased by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region, who must also approve alternate methods of compliance.

(Piper Service Bulletin No. 486, dated October 11, 1976, covers this subject.)

This amendment is effective January 13, 1977.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 1A10](https://openairdocs.org/tcds/1A10): Piper Aircraft Inc.; names 1 of 6 models: PA-23-250 (Navy UO-1)

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 899 (899 by airframe model, 0 by engine model)
- Makers: Piper 899

Models with the most aircraft:

- [Piper PA-23-250](https://openairdocs.org/model/piper-pa-23-250): 894 aircraft (airframe model)
- [Piper PA-23-250 (6PCLM)](https://openairdocs.org/model/piper-pa-23-250-6pclm): 5 aircraft (airframe model)

All 2 models: https://openairdocs.org/ad/77-01-05/models.md
Every aircraft: https://openairdocs.org/ad/77-01-05/aircraft.md

Its text cites no advisory circulars or STCs.

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