# AD 70-16-04: Cabin Cove Light Ballast

- Type: Airworthiness directive
- Status: Current
- Products: Boeing 707-100 Long Body, 707-100B Long Body, 707-100B Short Body, 707-200, 707-300 Series, 707-300B Series, 707-300C Series, 707-400 Series, 720 Series and 720B Series
- Effective: August 1, 1970
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-1052
- Registered aircraft: 6 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/CAF3CC58D0729704862568310070230E.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/70-16-04

## The airworthiness directive

70-16-04 BOEING: Amdt. 39-1052. Applies to Boeing Model 707/720 Series Airplanes. (Effectivity listed on Boeing Service Bulletin No. 2986 dated May 15, 1970, or later FAA approved revisions).

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

To prevent fire caused by failure of the Main Cabin Cove Light Ballast Capacitors deactivate the main cabin cove light circuits until one of the following items has been accomplished:

  (1) Relocate all main cabin ballast capacitors to the inboard side of the cove light race way as described in Boeing Service Bulletin No. 2986 dated May 15, 1970, or later FAA approved revisions.

  (2) Perform an equivalent modification approved by the Chief, Aircraft Engineering Division, FAA Western Region.

This Amendment becomes effective on August 1, 1970.

## Affected data sheets (3) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 4A21](https://openairdocs.org/tcds/4A21): The Boeing Company; names 4 of 4 models: 707-100B Short Body, 707-200, 707-100 Long Body, 707-100B Long Body
- [TCDS 4A26](https://openairdocs.org/tcds/4A26): The Boeing Company; names 4 of 4 models: 707-300B Series, 707-400 Series, 707-300 Series, 707-300C Series
- [TCDS 4A28](https://openairdocs.org/tcds/4A28): The Boeing Company; names 2 of 2 models: 720B Series, 720 Series

## 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: 6 (6 by airframe model, 0 by engine model)
- Makers: Boeing 6

Models with the most aircraft:

- [Boeing 707-338C](https://openairdocs.org/model/boeing-707-338c): 2 aircraft (airframe model)
- [Boeing 707-368C](https://openairdocs.org/model/boeing-707-368c): 1 aircraft (airframe model)
- [Boeing 707-321B](https://openairdocs.org/model/boeing-707-321b): 1 aircraft (airframe model)
- [Boeing 707-323B](https://openairdocs.org/model/boeing-707-323b): 1 aircraft (airframe model)
- [Boeing 707-351B](https://openairdocs.org/model/boeing-707-351b): 1 aircraft (airframe model)

All 5 models: https://openairdocs.org/ad/70-16-04/models.md
Every aircraft: https://openairdocs.org/ad/70-16-04/aircraft.md

Its text cites no advisory circulars or STCs.

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