# AD 65-03-03: Crankshaft Flange

- Type: Airworthiness directive
- Status: Current
- Products: Lycoming Engines IO-320-B1A
- Effective: August 5, 1967
- Superseded by: Nothing supersedes this AD
- Product type: Engine
- Amendment: 39-460
- Registered aircraft: 1,768 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/75549E953C0064A386256E0100545BC3.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/65-03-03

## The airworthiness directive

65-03-03 LYCOMING: Amdt. 39-460, Part 39- Federal Register February 2, 1965. Applies to Model IO- 320-BIA Engines Equipped with Hartzell HC-E2YL-2/7663-4 Propellers and Installed in Piper Model PA-30 Aircraft. Compliance required as indicated. To prevent crankshaft flange failure with a possible loss of propeller accomplish the following: (a) Add the following operating limitation to the airplane flight manual: Do not exceed 2,100 r.p.m. engine speed when demonstrating or practicing power-on-stalls. (b) Inspect engines in accordance with the procedure described in 2(a) and 2(b) of Lycoming Service Bulletin No. 300A before further flight following any flight involving acrobatic maneuvers (including spins) which are prohibited by the airplane placard and flight manual or any flight during which the limitation specified in (a) has been exceeded. If cracks are found in the crankshaft flange remove the crankshaft from service before further flight. NOTE: It is requested that any cracks found as the result of the inspections required by this AD be reported to the Engineering and Manufacturing Branch, FAA Eastern Region, John F. Kennedy International Airport, Jamaica, New York. This supersedes AD 64-15-05. This directive effective January 30, 1965. Revised August 5, 1967.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 1E12](https://openairdocs.org/tcds/1E12): Lycoming Engines; names 1 of 32 models: IO-320-B1A

## 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: 1,768 (0 by airframe model, 1,768 by engine model)
- Makers: Piper 927, Bellanca 309, Champion 138, Cessna 36, Pitts Special 4, Beech 2, Monocoupe 2, Nord 2, Patriot 2, Temco 2

Models with the most aircraft:

- [Lycoming IO-320 series](https://openairdocs.org/engine/lycoming-io-320-series): 1,707 aircraft (engine model)
- [Lycoming IO-320-B1A](https://openairdocs.org/engine/lycoming-io-320-b1a): 55 aircraft (engine model)
- [Superior IO-320 series](https://openairdocs.org/engine/superior-io-320-series): 6 aircraft (engine model)

All 3 models: https://openairdocs.org/ad/65-03-03/models.md
Every aircraft: https://openairdocs.org/ad/65-03-03/aircraft.md

Its text cites no advisory circulars or STCs.

## NTSB investigations that cite this AD (1)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB CHI96FA278](https://openairdocs.org/ntsb/CHI96FA278), Aug 8, 1996: Lancair 320 (N320L), Fond Du Lac, WI, destroyed, 1 fatal. Probable cause: the fatigue in the propeller flange with soft material and oversized lightening holes. A factor was the pilot's inability to maintain control of the aircraft due to the exceeded weight and balance…

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