# AD 76-07-12: Ignition Switches

- Type: Airworthiness directive
- Status: Current
- Products: Bendix Ignition Switches
- Effective: August 30, 1977
- Superseded by: Nothing supersedes this AD
- Product type: Appliance
- Amendment: 39-3024
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C14960A415D956BD86256E520053A53E.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/76-07-12

## The airworthiness directive

76-07-12 BENDIX IGNITION SWITCHES: Amendment 39-2575 as amended by Amendment 39-3024. Applies to all aircraft employing magnetos and using Bendix ignition switches listed in the table below except switches identified by four digit date code (new) adjacent to the model number or a white dot (modified) on the support plate adjacent to the Bendix logo.

Bendix Switches Rotary Action, Key or Lever Actuated Switch Function Bendix (series) Part Numbers Twist-to-Start 10-357XXX, 10-126XXX Twist-to-Start/Push-to-Prime 10-357XXX, 10-126XXX Push-to-Start 10-357XXX, 10-126XXX, 10-157XXX

Compliance required as indicated:

1. For switches subject to this AD, conduct the following checks within the next 100 hours' time in service and each 100 hours thereafter to detect possible switch malfunction:

  (a) Observing regular ground run-up procedures, allow the engine to reach operating temperatures and perform a normal magneto check.

  (b) With the engine at normal idle, rotate the switch key or lever through the "OFF" detent to the extreme limit of its travel in the "OFF" direction.

  (c) If the engine stops firing, this indicates an airworthy switch.

  (d) If the engine continues to run with the switch in the extreme "OFF" direction indicating a malfunctioning switch, prior to the next flight accomplish Part III outlined in Bendix Service Bulletin No. 583, dated April 1976, for Repair and Replacement or use an alternate method approved by Chief, Engineering and Manufacturing Branch, Eastern Region.

2. The aircraft may be flown in accordance with FAR 21.197 to a place where these modifications can be accomplished.

3. The checks required by this AD may be performed by the pilot.

4. Upon submission by an operator with substantiating data, an FAA Maintenance Inspector subject to prior approval of the Chief, Engineering and Manufacturing Branch, FAA Eastern Region may adjust the compliance times specified in this AD if the request contains substantiating data to justify the increase for the operator:

(NOTE: If the engine continues to run when complying with paragraph 1 and repair or replacement cannot or will not be accomplished immediately, the magneto (primary circuit) should be grounded in accordance with Bendix Service Bulletin No. 583, dated April 1976.)

Amendment 39-2575 was effective April 14, 1976.

This amendment 39-3024 is effective August 30, 1977.

## Registered aircraft it may apply to (OpenAirDocs)

No registered aircraft matched the models it names.

Its text cites no advisory circulars or STCs.

## NTSB investigations that cite this AD (4)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB LAX07LA209](https://openairdocs.org/ntsb/LAX07LA209), Jul 8, 2007: Cessna 152 (N95038), Tracy, CA, substantial damage. Probable cause: The pilot's improper recovery from a bounced landing and his failure to maintain directional control during the landing roll. Contributing to the accident were the operator's inadequate engine…
- [NTSB FTW96LA204](https://openairdocs.org/ntsb/FTW96LA204), May 9, 1996: Cessna 172G (N202EX), Okmulgee, OK, substantial damage. Probable cause: THE PILOT'S CONTINUED OPERATION WITH KNOWN DEFICIENCIES IN THE AIRPLANE AND THE PILOT'S AND MAINTENANCE PERSONNEL'S FAILURE TO COMPLY WITH AN AIRWORTHINESS DIRECTIVE RESULTING IN THE MALFUNCTIONING…
- [NTSB NYC82FNA13](https://openairdocs.org/ntsb/NYC82FNA13), May 11, 1982: Beech E33 (N7457N), Bedford, MA, substantial damage
- [NTSB LAX80FUA21](https://openairdocs.org/ntsb/LAX80FUA21), Aug 27, 1980: Cessna 210 (N8288M), Santa Ana, CA, substantial damage

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