What is the maximum oil pressure during an assisted air start?

What is the maximum oil pressure during an assisted air start?

• A. 182 PSI
• B. 95 PSI
• C. 200 PSI
• D. 150 PSI

Answer: (A)

During an assisted air start, the engine’s oil system experiences a brief, high-pressure spike as rotation is established by the pneumatic start. To protect bearings and seals from this transient, a defined maximum oil pressure is published for the start. The limit for this scenario is 182 psi, which is the highest allowable pressure during the start sequence. Normal running oil pressure is much lower than this, and once the engine spools and the pump is fully engaged, it settles into the normal range. The other numbers do not represent the specified start-limit, so 182 psi is the correct maximum.

During an assisted air start, the engine’s oil system experiences a brief, high-pressure spike as rotation is established by the pneumatic start. To protect bearings and seals from this transient, a defined maximum oil pressure is published for the start. The limit for this scenario is 182 psi, which is the highest allowable pressure during the start sequence. Normal running oil pressure is much lower than this, and once the engine spools and the pump is fully engaged, it settles into the normal range. The other numbers do not represent the specified start-limit, so 182 psi is the correct maximum.