# AD 67-23-02: Main Gear Downlock Rod

- 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: September 10, 1967
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Large airplane
- Amendment: 39-462
- Registered aircraft: 6 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/942048997422BE48862568310057CF90.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/67-23-02

## The airworthiness directive

67-23-02 BOEING: Amdt. 39-462, Part 39, Federal Register August 11, 1967. Applies to Model 707 and 720 Series Airplanes, except 707-300B and -300C Series.

Compliance required within the next 7,000 hours' time in service after the effective date of this AD unless already accomplished.

To prevent explosion of fuel vapors in the fuel tanks as a result of lightning-induced ignition at the fuel tank vent outlet, accomplish one of the following, or an equivalent, approved by the Chief, Aircraft Engineering Division, FAA Western Region

  (a) Install a flame and explosion suppression system in the fuel tank vent outlet system to prevent flame propagation through the vent system following ignition of vapor by lightning at the vent outlet; or

  (b) Install an auxiliary vent tube with flame arrester, to the vent system surge tank to provide, during flight, continuous airflow inward through the existing outlet and outward through the protected auxiliary tube.

This amendmenteffective September 10, 1967.

## 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/67-23-02/models.md
Every aircraft: https://openairdocs.org/ad/67-23-02/aircraft.md

Its text cites no advisory circulars or STCs.

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