# AD 71-24-01: Cabin Ceiling Light Switch

- Type: Airworthiness directive
- Status: Current
- Products: Boeing DC-9-11, DC-9-12, DC-9-13, DC-9-14, DC-9-15, DC-9-15F, DC-9-21, DC-9-31, DC-9-32, DC-9-32 (VC-9C), DC-9-32F, DC-9-32F (C-9A) and 10 more
- Effective: March 24, 1972
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-1413
- Registered aircraft: 99 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/2D725726482C572386256E01005AD76F.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/71-24-01

## The airworthiness directive

71-24-01 MCDONNELL DOUGLAS: Amdt. 39-1336 as amended by Amendment 39-1413. Applies to all DC-9 Series (except All-freighter) certified in all categories.

Compliance required within the next 100 hours' time in service after the effective date of this AD, unless already accomplished.

To prevent failure of the cabin ceiling lights rotary switch and circuit, accomplish the following:

Modify the ceiling light control wiring in accordance with either Douglas Aircraft Company Alert Service Bulletin A33-55, dated October 8, 1971, or later FAA-approved revisions, or Douglas Aircraft Company Service Bulletin No. 33-56, dated February 25, 1972, or later FAA-approved revisions, or other modification approved by the Chief, Aircraft Engineering Division, FAA Western Region.

Amendment 39-1336 was effective November 20, 1971.

This amendment 39-1413 is effective March 24, 1972.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A6WE](https://openairdocs.org/tcds/A6WE): The Boeing Company; names 19 of 25 models: DC-9-12, DC-9-15F, DC-9-41, DC-9-13, DC-9-34F, DC-9-81 (MD-81), DC-9-33F, DC-9-83 (MD-83)…

## 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: 99 (99 by airframe model, 0 by engine model)
- Makers: Mcdonnell Douglas 93, Douglas 6

Models with the most aircraft:

- [Mcdonnell Douglas DC-9-83(MD-83)](https://openairdocs.org/model/mcdonnell-douglas-dc-9-83-md-83): 49 aircraft (airframe model)
- [Mcdonnell Douglas DC-9-82(MD-82)](https://openairdocs.org/model/mcdonnell-douglas-dc-9-82-md-82): 22 aircraft (airframe model)
- [Mcdonnell Douglas DC-9-87](https://openairdocs.org/model/mcdonnell-douglas-dc-9-87): 13 aircraft (airframe model)
- [Mcdonnell Douglas DC-9-15F](https://openairdocs.org/model/mcdonnell-douglas-dc-9-15f): 3 aircraft (airframe model)
- [Mcdonnell Douglas DC-9-33F](https://openairdocs.org/model/mcdonnell-douglas-dc-9-33f): 3 aircraft (airframe model)
- [Douglas DC-9-83](https://openairdocs.org/model/douglas-dc-9-83): 1 aircraft (airframe model)
- [Douglas DC9-15](https://openairdocs.org/model/douglas-dc9-15): 1 aircraft (airframe model)
- [Douglas DC-9-15F](https://openairdocs.org/model/douglas-dc-9-15f): 1 aircraft (airframe model)
- [Douglas DC-9-21](https://openairdocs.org/model/douglas-dc-9-21): 1 aircraft (airframe model)
- [Douglas DC-9-32F](https://openairdocs.org/model/douglas-dc-9-32f): 1 aircraft (airframe model)
- [Mcdonnell Douglas DC-9-32](https://openairdocs.org/model/mcdonnell-douglas-dc-9-32): 1 aircraft (airframe model)
- [Mcdonnell Douglas DC-9-32F](https://openairdocs.org/model/mcdonnell-douglas-dc-9-32f): 1 aircraft (airframe model)
- [Douglas DC-9-33F](https://openairdocs.org/model/douglas-dc-9-33f): 1 aircraft (airframe model)
- [Mcdonnell Douglas DC-9-87 (MD-87)](https://openairdocs.org/model/mcdonnell-douglas-dc-9-87-md-87): 1 aircraft (airframe model)

All 14 models: https://openairdocs.org/ad/71-24-01/models.md
Every aircraft: https://openairdocs.org/ad/71-24-01/aircraft.md

Its text cites no advisory circulars or STCs.

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