# AD 46-17-01: Flap Control Universal Joint Pins

- Type: Airworthiness directive
- Status: Current
- Products: Boeing AT-6 (SNJ-2), AT-6A (SNJ-3), AT-6B, AT-6C (SNJ-4) and BC-1A
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Registered aircraft: 107 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A6E26BDD525B0F1886256A4500684A7E.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/46-17-01

## The airworthiness directive

46-17-01 NORTH AMERICAN: (Was Mandatory Note 5 of AD-2-575-3.) Applies to Army BC-1A, AT-6, -6A, -6B, -6C; Navy SNJ-2, -3, -4 Aircraft.

To be accomplished prior to original certification or at first periodic inspection thereafter.

Inspect the universal joint pins in the flap control push-pull tubes, P/N 19-152642, connecting the outer and inner flap for broken pins. Replace all broken pins with new pins and install a close fitting rubber hose over each universal joint to hold in place any pins which may break in the future.

(North American Service Bulletin dated March 6, 1947, covers this subject also.)

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A-2-575](https://openairdocs.org/tcds/A-2-575): The Boeing Company; names 5 of 9 models: AT-6A (SNJ-3), BC-1A, AT-6C (SNJ-4), AT-6 (SNJ-2), AT-6B

## 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: 107 (107 by airframe model, 0 by engine model)
- Makers: North American 82, North American/Victoria MNT LT 20, North American / Crosser G 1, North American-Collins 1, North American/Case M V JR 1, North American/Levrett 1, North American/Walker/Screws 1

Models with the most aircraft:

- [North American AT-6C](https://openairdocs.org/model/north-american-at-6c): 43 aircraft (airframe model)
- [North American AT-6](https://openairdocs.org/model/north-american-at-6): 28 aircraft (airframe model)
- [North American/Victoria MNT LT AT-6A](https://openairdocs.org/model/north-american-victoria-mnt-lt-at-6a): 20 aircraft (airframe model)
- [North American AT-6A](https://openairdocs.org/model/north-american-at-6a): 5 aircraft (airframe model)
- [North American AT-6B](https://openairdocs.org/model/north-american-at-6b): 3 aircraft (airframe model)
- [North American AT-6C(SNJ-4)](https://openairdocs.org/model/north-american-at-6c-snj-4): 3 aircraft (airframe model)
- [North American-Collins AT-6A](https://openairdocs.org/model/north-american-collins-at-6a): 1 aircraft (airframe model)
- [North American/Walker/Screws AT6C](https://openairdocs.org/model/north-american-walker-screws-at6c): 1 aircraft (airframe model)
- [North American / Crosser G AT6A](https://openairdocs.org/model/north-american-crosser-g-at6a): 1 aircraft (airframe model)
- [North American/Levrett AT6-C](https://openairdocs.org/model/north-american-levrett-at6-c): 1 aircraft (airframe model)
- [North American/Case M V JR AT-6](https://openairdocs.org/model/north-american-case-m-v-jr-at-6): 1 aircraft (airframe model)

All 12 models: https://openairdocs.org/ad/46-17-01/models.md
Every aircraft: https://openairdocs.org/ad/46-17-01/aircraft.md

Its text cites no advisory circulars or STCs.

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