# AD 71-14-06: Magnetos Grounding

- Type: Airworthiness directive
- Status: Current
- Products: Piper PA-28-140, PA-28-150, PA-28-160, PA-28-180 and PA-28-235
- Effective: July 9, 1971
- Published: July 15, 1971
- Issued: July 2, 1971
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-1243
- Registered aircraft: 8,998 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/37FC71FD498EB97286256997005836B5.0001
- DRS record last changed: November 21, 2025
- Page: https://openairdocs.org/ad/71-14-06

## The airworthiness directive

71-14-06 PIPER: Amdt. 39-1243. Applies to PA 28-140 airplanes Serial Numbers 28- 20001 through 28-23042, PA 28-150/-160/-180 airplanes Serial Numbers 28-1 through 28-4033, and PA 28-235 airplanes Serial Numbers 28-10001 through 28-10718, certificated in all categories.

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

To prevent possible inadvertent grounding of magnetos, accomplish the following:

  (a) Visually inspect the two terminals of the magneto filters on the aft side of the firewall. If these terminals are not insulated, install electrical nipples Piper P/N 23969-02 in accordance with Piper Service Bulletin 313, dated July 1, 1970, or later approved revision, or FAA approved equivalent.

This amendment becomes effective July 9, 1971.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 2A13](https://openairdocs.org/tcds/2A13): Piper Aircraft Inc.; names 5 of 18 models: PA-28-150, PA-28-140, PA-28-160, PA-28-180, PA-28-235

## 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: 8,998 (8,998 by airframe model, 0 by engine model)
- Makers: Piper 8,997, Piper/Valdes-Ervin 1

Models with the most aircraft:

- [Piper PA-28-140](https://openairdocs.org/model/piper-pa-28-140): 4,258 aircraft (airframe model)
- [Piper PA-28-180](https://openairdocs.org/model/piper-pa-28-180): 3,504 aircraft (airframe model)
- [Piper PA-28-235](https://openairdocs.org/model/piper-pa-28-235): 859 aircraft (airframe model)
- [Piper PA-28-160](https://openairdocs.org/model/piper-pa-28-160): 253 aircraft (airframe model)
- [Piper PA-28-150](https://openairdocs.org/model/piper-pa-28-150): 123 aircraft (airframe model)
- [Piper/Valdes-Ervin PA-28-235](https://openairdocs.org/model/piper-valdes-ervin-pa-28-235): 1 aircraft (airframe model)

All 6 models: https://openairdocs.org/ad/71-14-06/models.md
Every aircraft: https://openairdocs.org/ad/71-14-06/aircraft.md

Its text cites no advisory circulars or STCs.

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