# AD 52-01-02: Horns and Drag Brace Fittings

- Type: Airworthiness directive
- Status: Current
- Products: Scotts-Bell 47 47B, 47B3 and 47D
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Rotorcraft
- Registered aircraft: 5 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/08740A61DDFEA2AF86256A34004EAF8F.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/52-01-02

## The airworthiness directive

52-01-02 BELL: Applies to All Models 47B, and 47B3 Helicopters and to Model 47D Helicopters Serial Numbers 1 to 79, Inclusive.

Compliance required at next 300-hour overhaul, but not later than March 1, 1952.

To increase the safety of the main rotor blade equalizer horns and drag brace fittings, which have failed in accidents involving damage to the main rotor, replace the existing equalizer horn (P/N 47-120-027-2) and drag brace fitting (P/N 47-110-145-2) with revised parts P/N 47- 120-167-1 and P/N 47-110-235-1, respectively.

(Bell Service Bulletin No. 77 covers this same subject.)

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS H-1](https://openairdocs.org/tcds/H-1): Scott's-Bell 47 Inc; names 3 of 9 models: 47B, 47B3, 47D

## 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: 5 (5 by airframe model, 0 by engine model)
- Makers: Bell 5

Models with the most aircraft:

- [Bell 47D](https://openairdocs.org/model/bell-47d): 4 aircraft (airframe model)
- [Bell 47B](https://openairdocs.org/model/bell-47b): 1 aircraft (airframe model)

All 2 models: https://openairdocs.org/ad/52-01-02/models.md
Every aircraft: https://openairdocs.org/ad/52-01-02/aircraft.md

Its text cites no advisory circulars or STCs.

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