# AD 52-01-06: Tail Boom Spoiler

- Type: Airworthiness directive
- Status: Current
- Products: Scotts-Bell 47 47, 47B, 47B3, 47D, 47D1, 47E, 47G, 47G-2, 47G-2A, 47G-2A-1, 47G-3, 47G-3B and 12 more
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Rotorcraft
- Registered aircraft: 490 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/60421B7AAF791E4186256A4D004F79D9.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/52-01-06

## The airworthiness directive

52-01-06 BELL: (Applies to All Model 47 series Helicopters Having Covered Tail Booms.

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

To prevent the main rotor striking the tail boom as a result of boom deflection when yawing at high forward speed, install the 47-706-211-1 or -2 spoiler on the tail boom. (Note: Spoiler must not be installed on any helicopter having an uncovered tail boom.)

(Bell Service Bulletin No. 81 covers this same subject.)

## Affected data sheets (3) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 2H3](https://openairdocs.org/tcds/2H3): Scott's-Bell 47 Inc; names 11 of 11 models: 47G-2A, 47G-3B, 47G-3, 47G-4A, 47G-5A, 47G-5, 47G-3B-2A, 47G-3B-2…
- [TCDS H-1](https://openairdocs.org/tcds/H-1): Scott's-Bell 47 Inc; names 9 of 9 models: 47H-1, 47B, 47B3, 47D1, 47D, 47G-2, 47G, 47…
- [TCDS 2H1](https://openairdocs.org/tcds/2H1): Scott's-Bell 47 Inc; names 4 of 4 models: 47K, 47J-2, 47J-2A, 47J

## 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: 490 (490 by airframe model, 0 by engine model)
- Makers: Bell 476, Bell-K-Copter 3, Bell Kitz Kopters 1, Bell-Allied Helicopter 1, Bell-Carson 1, Bell-Huddleston And Wilson 1, Bell-Intermountain 1, Bell-Olympic Helicopters 1, Bell-Shippey 1, Bell-Tellijohn 1

Models with the most aircraft:

- [Bell 47G-2](https://openairdocs.org/model/bell-47g-2): 87 aircraft (airframe model)
- [Bell 47G-3B-1](https://openairdocs.org/model/bell-47g-3b-1): 86 aircraft (airframe model)
- [Bell 47G](https://openairdocs.org/model/bell-47g): 55 aircraft (airframe model)
- [Bell 47D1](https://openairdocs.org/model/bell-47d1): 47 aircraft (airframe model)
- [Bell 47G-5](https://openairdocs.org/model/bell-47g-5): 40 aircraft (airframe model)
- [Bell 47G-3B-2](https://openairdocs.org/model/bell-47g-3b-2): 26 aircraft (airframe model)
- [Bell 47G-4A](https://openairdocs.org/model/bell-47g-4a): 20 aircraft (airframe model)
- [Bell 47G-2A](https://openairdocs.org/model/bell-47g-2a): 19 aircraft (airframe model)
- [Bell 47G-5A](https://openairdocs.org/model/bell-47g-5a): 19 aircraft (airframe model)
- [Bell 47G-3B](https://openairdocs.org/model/bell-47g-3b): 15 aircraft (airframe model)
- [Bell 47G-2A-1](https://openairdocs.org/model/bell-47g-2a-1): 13 aircraft (airframe model)
- [Bell 47G-4](https://openairdocs.org/model/bell-47g-4): 13 aircraft (airframe model)
- [Bell 47G3B2A](https://openairdocs.org/model/bell-47g3b2a): 7 aircraft (airframe model)
- [Bell 47H-1](https://openairdocs.org/model/bell-47h-1): 6 aircraft (airframe model)
- [Bell 47J](https://openairdocs.org/model/bell-47j): 6 aircraft (airframe model)
- [Bell 47J-2](https://openairdocs.org/model/bell-47j-2): 6 aircraft (airframe model)
- [Bell 47J-2A](https://openairdocs.org/model/bell-47j-2a): 5 aircraft (airframe model)
- [Bell 47D](https://openairdocs.org/model/bell-47d): 4 aircraft (airframe model)
- [Bell-K-Copter 47G](https://openairdocs.org/model/bell-k-copter-47g): 2 aircraft (airframe model)
- [Bell 47B](https://openairdocs.org/model/bell-47b): 1 aircraft (airframe model)

All 35 models: https://openairdocs.org/ad/52-01-06/models.md
Every aircraft: https://openairdocs.org/ad/52-01-06/aircraft.md

Its text cites no advisory circulars or STCs.

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