Page:CAB Accident Report, Pennsylvania-Central Airlines Flight 143.pdf/8

 The engine maximums authorized in the aircraft airworthiness certificate of NC 13359 at the time of the accident were as follows:

When the manufacturer sought an Approved Type Certificate for Wasp S1H1-G engines in 1934, the usual tests were run. During these tests the engine was operated continuously for 50 hours at an average of 35.6 inches manifold pressure, at 2200 r.p.m., and at an average of 556 h.p., without in any way adversely affecting the engine.

The airplane was equipped with Hamilton Standard, constant speed, hydromatic, full-feathering propellers.