Overheating circuit breakers.
Requested TYCOMS to direct their units to inspect switchboards for AQB-A402, AQB-LF402 and NQB-A402 circuit breakers. If found, ships force should note the serial number, SPD part number (ETN), and date of manufacture. The serial number is stamped in black on the face of the breaker and on the side of the circuit breaker base. The nameplate on the face of the breaker shows the type of breaker, the SPD part number (ETN number), and year of manufacture. For circuit breakers without motor operators, the nameplate and serial number will be visible once the switchboard front cover is removed or opened. For circuit breakers with motor operators, remove the motor operator to see the circuit breaker nameplate and serial number. Ships force should complete the inspection during their next in-port period.
1. Report breaker type, serial number, SPD part number (ETN), and date of manufacture to ISIC. ISIC's will report completion of inspection and conditions found to the TYCOM for submittal to PMS 392T.
2. Coordinate with the ISIC to replace any circuit breakers that have not been repaired.
3. If the breakers cannot be replaced immediately, the ship should coordinate with the PMT to conduct thermal imaging of affected circuit breakers as soon as practicable. If the thermal imaging indicates higher than normal operating temperatures, the breakers should be placed on limited service until replaced.
4. Submit a quality deficiency report (QDR) with the original REQN number. If the circuit breaker was not requisitioned by ships force, coordinate with installing activity to determine REQN number. If circuit breaker was not obtained through supply system, then no REQN number required. The failure description on the QDR should state that the circuit breaker has been recalled by the manufacturer and is being returned for free, OEM inspection. REF: COMNAVSEASYSCOM Washington DC 281201Z DEC 10.