51-11-01 MARTIN: Applies to All Models 202 and 202A Airplanes Except as Noted.
Compliance required as specified herein.
Compliance with this note cancels the requirements of AD 50-41-02.
In order to comply with the recommendations of the Martin 202 Modification Board, the following items must be accomplished. In all cases, modifications which are demonstrated to provide a level of safety equivalent to that provided by the modifications listed herein will be acceptable in lieu of the listed modifications.
Compliance required by August 16, 1951.
1. Decrease breaker rating for propeller anti-icing circuit to 5 amperes to accommodate No. 20 wire. (Applies to Model 202 airplanes only.)
2. Install negative pressure scoop on battery vent line.
Compliance require by November 16, 1951.
1. Add manually operated charging valve in the emergency brake hydraulic system in accordance with Glenn L. Martin Co. Service Bulletin No. 185.
Compliance required by December 1, 1951.
1. Provide circuit protection for voltmeter.
2. Provide circuit protection at main bus for generator tip light circuit.
3. Provide circuit protection for ammeter wires.
Compliance required by February 1, 1952.
1. Install circuit breaker in circuit breaker panel with wire routed back to auxiliary bus control relay.