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A driver hears air venting from a tank valve at 150 psi and the gauge is still climbing. What two devices have effectively failed or been exceeded?
- A.The foot valve and the slack adjuster
- B.The wig wag and the horn
- C.The air dryer and the gladhand
- D.The governor has failed to cut out the compressor, leaving the safety valve as the only protection
Correct answer
D. The governor has failed to cut out the compressor, leaving the safety valve as the only protection
Why
Rising pressure past cut-out is a governor-side failure by definition. The venting safety valve proves it is doing its emergency job while also proving the normal control needs repair.
Manual topic: Air Brakes - Safety Valve and Low Pressure Warning · From the Air Brakes practice bank (AB-068).