# AD 50-47-02: Sensenich Propeller Blades

- Type: Airworthiness directive
- Status: Current
- Products: Superior V and V-2
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Registered aircraft: 11 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/3E52A21F8C9D5BD686256A56006AC831.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/50-47-02

## The airworthiness directive

50-47-02 CULVER: Applies to All Models V and V2 Aircraft Equipped With Sensenich Models C2FB3 or C2FB1 Propeller With C276A2, PC276A6, PC276A7 and C276A6 Blades.

Compliance required as indicated.

  (1) Replacement required prior to January 31, 1951.

In order to eliminate the continued occurrence of broken blade lag screws and/or cracked blade shanks and ferrules, all C276A2 blades must be retired from service and replaced with blade Model PC276A6, PC276A7 or C276A6.

  (2) Inspection required every 500 hours of operation after installation of blade Models PC276A6, PC276A7 and C276A6.

The propeller blades should be removed from the hub, and the wood blade shank and the split retaining ring groove in the blade ferrule should be carefully inspected for cracks. The lag screws should be check-tightened to 160 inch-pounds torque. Blade with broken lag screws or cracked wood shank or ferrule must be removed from service. The ferrule and all ferrous metallic parts of the hubshould be magnetically inspected.

The blades are subjected to excessive vibratory stresses when operation beyond the allowable engine r.p.m. ratings inadvertently occurs. It is recommended, therefore, that the accuracy of the tachometer be checked in order to preclude such operation. Operation between 1,800-2,000 r.p.m. is to be avoided when the nose landing gear is extended.

(Sensenich Service Bulletins Nos. 133, 134 and 135 cover these same subjects.)

This supersedes AD 47-47-09.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A-778](https://openairdocs.org/tcds/A-778): Superior Aircraft Company; names 2 of 2 models: V-2, V

## 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: 11 (11 by airframe model, 0 by engine model)
- Makers: Culver 11

Models with the most aircraft:

- [Culver V](https://openairdocs.org/model/culver-v): 11 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/50-47-02/models.md
Every aircraft: https://openairdocs.org/ad/50-47-02/aircraft.md

Its text cites no advisory circulars or STCs.

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