# AD 52-02-01: Bronze Rear Spar Fittings

- Type: Airworthiness directive
- Status: Current
- Products: Consolidated Vultee Aircraft Corporation, Stinson Division BT-13, BT-13A (Army SNV-1), BT-13B (Navy SNV-2) and BT-15
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Registered aircraft: 110 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/95BCD0C25AD8986F86256A380059F227.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/52-02-01

## The airworthiness directive

52-02-01 Convair: Applies to All Model BT-13, -13A, -13B and BT-15 Aircraft With Bronze Rear Spar to Center Section Attachment Fittings.

Compliance required as indicated.

When it has been determined that the rear spar to center section attachment fittings are bronze castings, compliance with this Airworthiness Directive should be effected every 24 hours flying time or every 6 months nonflying time, whichever occurs first.

  (1) Inspect visually the rear spar to center section attachment fittings on both sides of the rear spar for evidence of cracks. All cracked fittings (see Figure 1) should be replaced with new fittings of equivalent or greater strength.

FIGURE 1

  (2) A magnet may be used to determine if the fitting is a steel casting.

  (3) Fittings that have been made from aluminum alloy forgings can be readily differentiated from those made from bronze castings by visual inspection.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A-2-571](https://openairdocs.org/tcds/A-2-571): Consolidated Vultee Aircraft Corporation Stinson Division; names 4 of 4 models: BT-13B (Navy SNV-2), BT-15, BT-13, BT-13A (Army SNV-1)

## 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: 110 (110 by airframe model, 0 by engine model)
- Makers: Consolidated Vultee 82, Convair 21, Cons Vultee/Basinger 1, Cons Vultee/Lacey 1, Cons Vultee/Pittman 1, Consolidated Vultee/Gunderson 1, Consolidated Vultee/Vanech 1, Consolidated/Nocco C 1, Vultee/Reed Ron 1

Models with the most aircraft:

- [Consolidated Vultee BT-13A](https://openairdocs.org/model/consolidated-vultee-bt-13a): 56 aircraft (airframe model)
- [Convair BT-13A](https://openairdocs.org/model/convair-bt-13a): 11 aircraft (airframe model)
- [Consolidated Vultee BT-13B (SNV-2)](https://openairdocs.org/model/consolidated-vultee-bt-13b-snv-2): 11 aircraft (airframe model)
- [Consolidated Vultee BT-15](https://openairdocs.org/model/consolidated-vultee-bt-15): 8 aircraft (airframe model)
- [Consolidated Vultee BT-13](https://openairdocs.org/model/consolidated-vultee-bt-13): 7 aircraft (airframe model)
- [Convair BT-15](https://openairdocs.org/model/convair-bt-15): 4 aircraft (airframe model)
- [Convair BT-13](https://openairdocs.org/model/convair-bt-13): 3 aircraft (airframe model)
- [Convair BT-13B](https://openairdocs.org/model/convair-bt-13b): 3 aircraft (airframe model)
- [Consolidated/Nocco C VULTEE BT-13](https://openairdocs.org/model/consolidated-nocco-c-vultee-bt-13): 1 aircraft (airframe model)
- [Cons Vultee/Pittman BT13](https://openairdocs.org/model/cons-vultee-pittman-bt13): 1 aircraft (airframe model)
- [Consolidated Vultee/Gunderson BT-13A](https://openairdocs.org/model/consolidated-vultee-gunderson-bt-13a): 1 aircraft (airframe model)
- [Consolidated Vultee/Vanech BT-13A](https://openairdocs.org/model/consolidated-vultee-vanech-bt-13a): 1 aircraft (airframe model)
- [Cons Vultee/Basinger BT-13A](https://openairdocs.org/model/cons-vultee-basinger-bt-13a): 1 aircraft (airframe model)
- [Cons Vultee/Lacey BT-13B](https://openairdocs.org/model/cons-vultee-lacey-bt-13b): 1 aircraft (airframe model)
- [Vultee/Reed Ron BT-13A](https://openairdocs.org/model/vultee-reed-ron-bt-13a): 1 aircraft (airframe model)

All 15 models: https://openairdocs.org/ad/52-02-01/models.md
Every aircraft: https://openairdocs.org/ad/52-02-01/aircraft.md

Its text cites no advisory circulars or STCs.

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