OpenAirDocs.org

AD 80-25-05

Open the Markdown

Airworthiness directive · Voltage Regulator Modification · Piper PA-31T and PA-31T1

FAA copy· 19 KB
Download from FAA DRS
AboutSource files 1
Effective
February 12, 1981
Published
February 12, 1981
Issued
January 29, 1981
Models
PA-31T, PA-31T1
Data sheet
TCDSA8EA
Registered aircraft
151 matched by model
Product
Aircraft · Small airplane
Amendment
39-4041

Unofficial copy of the text in the FAA’s Dynamic Regulatory System. The FAA’s own copy is the authoritative one. DRS record last changed November 21, 2025.

On this page

The airworthiness directive

80-25-05 PIPER: Amendment 39-4041. Applies to Piper PA-31T S/N 8120001 thru 8120010 and Piper PA-31T1 airplanes S/N 8104001 thru 8104012.

Compliance required as indicated:

To prevent failure of the voltage regulator which can result in complete electrical failure, prior to further flight either at night or into instrument weather conditions, alter the voltage regulator, Piper P/N 584152 in accordance with Piper telegraphic letter #31-26, dated November 26, 1980, or an approved equivalent.

Equivalent alterations must be approved by the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region, Jamaica, New York.

This amendment is effective February 12, 1981, and was effective upon receipt for all recipients of the letter of November 26, 1980, covering this same subject.

Affected TCDS · 1

The type certificate data sheets for the models this AD names, matched by model and maker.

TCDS A8EAPiper Aircraft Inc.Names 2 of 6 models: PA-31T and PA-31T1

Registered aircraft · 151

Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.

By aircraft maker
  • Piper151
By year built
19741984

37 with no year recorded

By model

Aircraft

N105MAMorrison Andrew · Haverford, PABuilt 1980 · S/N 31T-8104015N108UCHot Springs Flyers Inc · Covington, LABuilt 1979 · S/N 31T-8020018N111JFJoyce Aviation Inc · Winston Salem, NCBuilt 1981 · S/N 31T8120012
See all 151 aircraft

NTSB investigations that cite this AD · 1

Their narratives or probable cause name AD 80-25-05, often to say whether the aircraft complied with it.

NTSB ANC97IA035Incident · No injuriesIncident investigationFinal reportPiper PA-31-350 · Kotzebue, AKthe jammed main landing gear which was caused by a binding main landing gear door with a broken hinge. The fractured, inadequate main landing gear door hinge was also causal.Mar 15, 1997 · N3542H · Minor damage