# AD 70-22-05: Electrical System Modifications

- Type: Airworthiness directive
- Status: Current
- Products: Piper PA-23-250 (Navy UO-1), PA-30, PA-31 and PA-31-300
- Effective: November 30, 1971
- Published: November 25, 1971
- Issued: November 16, 1971
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-1344
- Registered aircraft: 1,806 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/437743BC17D3633B86256E01005ACBA9.0001
- DRS record last changed: November 21, 2025
- Page: https://openairdocs.org/ad/70-22-05

## The airworthiness directive

70-22-05 PIPER: Amdt. 39-1099 as amended by Amendment 39-1344. Applies to Piper PA 23-250 type Aircraft S/N 27-3837 and 27-3944 to 27-4442 incl.; PA-30, S/Nos. 30-1717, 30-1746 to 30-2000, Incl.; PA-31 and PA-31-300, S/Nos. 31-228, 31-230, 31-231, 31-233 to 31- 588. Certificated for Instrument Flight.

Compliance required within the next 100 hours in service after the effective date of this AD, unless already accomplished.

To prevent the hazards associated with the possibility of a complete loss of electrical power while operating under Instrument Flight Rules. Accomplish the following:

  (a) Modify the aircraft electrical system in accordance with Piper Service Bulletin No. 306 dated January 9, 1970 or equivalent method approved by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region.

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 & Manufacturing Branch, FAA Eastern Region.

Amendment 39-1099 was effective November 4, 1970.

This Amendment 39-1344 is effective November 30, 1971.

## Affected data sheets (3) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A20SO](https://openairdocs.org/tcds/A20SO): Piper Aircraft Inc.; names 2 of 4 models: PA-31, PA-31-300
- [TCDS 1A10](https://openairdocs.org/tcds/1A10): Piper Aircraft Inc.; names 1 of 6 models: PA-23-250 (Navy UO-1)
- [TCDS A1EA](https://openairdocs.org/tcds/A1EA): Piper Aircraft Inc.; names 1 of 3 models: PA-30

## 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: 1,806 (1,806 by airframe model, 0 by engine model)
- Makers: Piper 1,806

Models with the most aircraft:

- [Piper PA-23-250](https://openairdocs.org/model/piper-pa-23-250): 894 aircraft (airframe model)
- [Piper PA-30](https://openairdocs.org/model/piper-pa-30): 878 aircraft (airframe model)
- [Piper PA-31](https://openairdocs.org/model/piper-pa-31): 26 aircraft (airframe model)
- [Piper PA-23-250 (6PCLM)](https://openairdocs.org/model/piper-pa-23-250-6pclm): 5 aircraft (airframe model)
- [Piper PA-31-300](https://openairdocs.org/model/piper-pa-31-300): 3 aircraft (airframe model)

All 5 models: https://openairdocs.org/ad/70-22-05/models.md
Every aircraft: https://openairdocs.org/ad/70-22-05/aircraft.md

Its text cites no advisory circulars or STCs.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.