Illuminating Critical Systems: The Technical Specifics of the Indicator Light
In complex machinery and aviation platforms, clear, immediate visual feedback is paramount. The component identified by NSN 6220-01-365-7989 serves precisely this function: an INDICATOR LIGHT designed to convey specific circuit status information.
Part Identification and Designation
The primary designation for this component is 6220-01-365-7989. It is officially cataloged under Item Name Code (INC) 00160 as LIGHT, INDICATOR. This component is an integral part of Supply Group (FSG) 62 and was assigned its NSN on October 14, 1992. Several alternate part numbers exist for cross-reference, including 706005516, 706005-516, and the simplified numeric reference 6220013657989.
Design and Physical Characteristics
This specific indicator light features a RECTANGULAR FRAME TYPE design. Its physical dimensions are precisely controlled:
- Overall Length: 1.500 INCHES NOMINAL
- Overall Height: Ranging between 0.365 INCHES MINIMUM and 0.380 INCHES MAXIMUM
The unit is constructed to accommodate two internal incandescent lamps. The lamp industry standard specified is 328, utilizing a T-1 3/4 bulb size with a MIDGET FLANGED base type. The design incorporates provisions for a single lens, which is secured via a flange mounting method. Furthermore, the unit includes one integrated filter.
Installation and Circuitry
Mounting is achieved through an UNTHREADED HOLE method. The electrical interface is established via 4 WIRE LEAD terminals. Importantly, this is configured for a TWO LAMP SEPARATE multlialmp circuit type, allowing for independent status indication from the two housed lamps.
Durability and Environmental Resistance
Given its application, the indicator light must withstand severe operational conditions. The specifications confirm robust resistance across several environmental factors:
- DUST RESISTANT
- HEAT RESISTANT
- HUMIDITY RESISTANT
- OZONE RESISTANT
- SALT SPRAY RESISTANT
- SHOCK RESISTANT
- VIBRATION RESISTANT
Real-World Application Context
The end-item identification associated with this specific part number points toward deployment in high-reliability aerospace systems, explicitly citing use on the B-1B ACFT (B-1B Lancer strategic bomber). In such an environment, these lights are crucial for cockpit annunciator panels, providing pilots with immediate visual confirmation regarding system status, landing gear position, or warning conditions.
Manufacturer Insight
A key supplier for this component, identified by Cage Code 19623, is GE AVIATION SYSTEMS LLC DBA GE AVIATION. They manufacture the version corresponding to part number 706005-516.