# AD 64-10-04: Carburetor Air Box Deflector Vanes

- Type: Airworthiness directive
- Status: Current
- Products: Piper PA-24-250
- Effective: May 12, 1964
- Published: May 12, 1964
- Issued: May 5, 1964
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Registered aircraft: 1,222 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/E577D601E6F0E86D862569970057FC86.0001
- DRS record last changed: November 21, 2025
- Page: https://openairdocs.org/ad/64-10-04

## The airworthiness directive

64-10-04 PIPER: Amdt. 728 Part 507 Federal Register May 12, 1964. Applies to Model PA-24-250 Aircraft, Compliance required within 50 hours' time in service after the effective date of this AD.

In order to prevent portions of the carburetor air box deflector vanes from breaking loose and lodging within the carburetor throat, remove the deflector vanes from the air box, P/N 21943- 03, in accordance with Piper Service Letter No. 420. Upon removal of these vanes, the air box P/N becomes 21943-05.

(Piper Service Letter No. 420 dated March 5, 1964, covers this subject.)

This directive effective May 12, 1964.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 1A15](https://openairdocs.org/tcds/1A15): Piper Aircraft Inc.; names 1 of 4 models: PA-24-250

## 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: 1,222 (1,222 by airframe model, 0 by engine model)
- Makers: Piper 1,222

Models with the most aircraft:

- [Piper PA-24-250](https://openairdocs.org/model/piper-pa-24-250): 1,222 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/64-10-04/models.md
Every aircraft: https://openairdocs.org/ad/64-10-04/aircraft.md

Its text cites no advisory circulars or STCs.

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