What are the LPAC lead, standby, and emergency pressures for LPAC air?

• A. 125, 120, 115
• B. 110, 105, 100
• C. 125 PSI, 120 PSI, 115 PSI
• D. 130, 125, 120

Answer: (C)

LPAC air is governed by three defined pressure levels: lead, standby, and emergency. These setpoints ensure you have normal starting and operation pressure, plus two fallback levels if the primary supply drops.

The standard values are 125 PSI for lead, 120 PSI for standby, and 115 PSI for emergency. The 5-psi steps between levels create a clear margin so that if the lead pressure falls, the standby can still supply adequate air, and if that also drops or demand spikes, the emergency pressure can maintain essential functions at a lower, safe level. The other options either omit units or use pressures that don’t match the expected tolerances, so they don’t align with the documented LPAC specifications.