# AD 50-04-01: Ignition Switches

- Type: Airworthiness directive
- Status: Current
- Products: Briggs & Stratton Ignition Switches
- Superseded by: Nothing supersedes this AD
- Product type: Appliance
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/2ABEAB064CABDF5F86256A3200604B11.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/50-04-01

## The airworthiness directive

50-04-01 BRIGGS AND STRATTON: Applies to All Aircraft Equipped With Army Air Force Type A-8 Ignition Switches Manufactured by Briggs and Stratton.

Initial compliance required not later than March 1, 1950, and every 100 hours operation thereafter.

A serious hazard may exist on this type switch after considerable use has worn the internal switch lever stops, allowing overtravel past the "OFF" position. Such overtravel may allow the magneto ground to be broken and permit the engine to fire when the switch is in the "OFF" position.

Type A-8 ignition switches manufactured by Briggs and Stratton can be identified by the name Briggs and Stratton stamped on the rear of the switch case. Another distinguishing feature of this switch is a formed sheet metal lever which is not found on other makes of type A-8 switch.

1. Inspection should consist of the following: Check switch lever for overtravel past the "OFF" position. Figure 1 shows the location of the switch lever in the "OFF" position. The pointer projecting from the lever points to the middle "F" in the word "OFF". When the lever can be turned to a point beyond the centerline of the "O" in the word "OFF", the rotation stops have becomes worn and the switch should be replaced.

2. This inspection must be repeated at 100-hour intervals.

3. Inspection may be discontinued if switch is replaced by Type A-8 of another make or by some other satisfactory type ignition switch.

## Registered aircraft it may apply to (OpenAirDocs)

No registered aircraft matched the models it names.

Its text cites no advisory circulars or STCs.

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