61-21-05: Compass Circuit Breakers
FAA order 61-21-05 is an airworthiness directive in force since November 2, 1961. The FAA's subject line: Compass Circuit Breakers. System: other and general.
What it applies to as the FAA lists it
- Kind of product
- Aircraft
- Makes
- Lockheed Martin Corporation
- Models
- 188A, 188C
Dates and paperwork
- In force since
- November 2, 1961
- Docket
- Unknown
- Status
- Current
- The FAA's document
- Read the order on the FAA's site
The order itself the regulatory text, as published
Show the full text (914 characters)
61-21-05 LOCKHEED: Amdt. 342 Part 507 Federal Register October 3, 1961. Applies to All Model 188 Aircraft.
Compliance required as indicated.
Several instances of inadvertent tripping of compass circuit breakers have occurred due to bumping the ganging bar by the occupant of the observers seat. Due to the effect of the loss of heading information upon operational safety, accomplishment of the following is required:
Within the next 100 hours' time in service after the effective date of this AD, inspect the pilot's and copilot's compass circuit breakers, and if the circuit breakers are ganged together, either remove the ganging bars, or install a protective guard which precludes inadvertent operation of the ganging bar. (These circuit breakers are located in the lowest circuit breaker panel beside the observers seat on the left side of the flight deck.)
This directive effective November 2, 1961.
Source: FAA Dynamic Regulatory System, airworthiness directives. The FAA's document is the authority; the register counts are this site's, from the FAA register of November 6, 2026. Connections as data: /graph/directive/61-21-05.json · aircraft systems.