Boeing 737 Master-Caution Warning Light Keychain (One Unit)
USD 9.99 USD
Specifications
| Type | keychain |
| Country/Region Of Manufacture | United States |
The Master Caution system was developed for the 737 to ease pilot workload as it was the first Boeing airliner to be produced without a flight engineer. Master caution lights and the system annunciator are powered from the battery bus and will illuminate when an amber caution light illuminates.
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