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AD 73-09-06

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Airworthiness directive · Operating Limitation Placard - Throttle Hangup · Piper PA-22, PA-22-108, PA-22-135 and 5 more

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AboutSource files 1
Effective
May 7, 1973
Published
May 3, 1973
Issued
April 20, 1973
Models
PA-22, PA-22-108, PA-22-135, PA-22-150, PA-22-160, PA-22S-135, PA-22S-150, PA-22S-160
Data sheet
TCDS1A6
Registered aircraft
2,943 matched by model
Product
Aircraft · Small airplane
Amendment
39-1631

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

73-09-06 PIPER: Amendment 39-1631. Applies to Model PA-22-150, PA-22S-150, PA-22-160 and PA-22S-160 aircraft equipped with Lycoming O-320 series engines and Marvel Schebler Carburetors Model MA-4-SPA, Part Numbers 10-3678-11, 10-3678-12, 10-3678-32, and to other PA-22 type aircraft which have been modified to these engine/carburetor configurations.

Compliance required within the next 10 hours in service after the effective date of this AD, unless already accomplished.

To prevent power interruption and acceleration hangup resulting from abrupt throttle movement, accomplish the following:

Attach the following operating limitation placard to the instrument panel near the throttle in full view of the pilot. Use 1/8 inch min. size lettering.

"DO NOT OPEN THROTTLE RAPIDLY - (IDLE TO FULL THROTTLE, 2 SECONDS MINIMUM)"

The placard may be fabricated by the owner or operator.

This amendment is effective May 7, 1973.

Affected TCDS · 1

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

TCDS 1A6Piper Aircraft Inc.Names all 8 models: PA-22S-135, PA-22S-150, PA-22-108 and 5 more

Registered aircraft · 2,943

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
  • Piper2,942
  • Piper/Pierce Tony1
By year built
19101964

607 with no year recorded

By model

Aircraft

N108CSFlight Expo Inc · Zimmerman, MNS/N 22-9054N10HFFrancis Harvey B · Fairbanks, AKS/N 22-2432N10PSCarson Glen W · Garber, OKBuilt 1955 · S/N 22-2687
See all 2,943 aircraft

NTSB investigations that cite this AD · 2

Their narratives or probable cause name AD 73-09-06, often to say whether the aircraft complied with it.

NTSB ANC15LA034Accident · Minor injuriesLimited investigationFinal reportPiper PA 22 · Skwentna, AKThe pilot's failure to follow the airplane's operating limitations by rapidly opening the throttle, which resulted in a loss of engine power. Contributing to the accident was the pilot's decision to maneuver the airplane at low altitude even though he was not…Jun 1, 2015 · N2828P · Substantial damageNTSB NYC00LA132Accident · Minor injuriesLimited investigationFinal reportPiper PA-22 · Moneta, VALoss of power for undetermined reasons.May 13, 2000 · N6841B · Substantial damage