| APU Limitations and / or Recommended Procedures |
Maximum APU Operating Altitude
Maximum APU Start Altitude*
Maximum APU Altitude Electrical Load Only
Maximum APU Altitude Bleed Air Load Only
Maximum APU Altitude Combined Bleed and Electrical
Maximum APU Start Altitude*
Maximum APU Altitude Electrical Load Only
Maximum APU Altitude Bleed Air Load Only
Maximum APU Altitude Combined Bleed and Electrical
41,000 ft
41,000 ft
41,000 ft
17,000 ft
10,000 ft
41,000 ft
41,000 ft
17,000 ft
10,000 ft
| L |
* Successful starts are not assured above FL 250.
Operate the APU for one full minute with no bleed air load prior to shutdown.
The APU bleed valve must be closed when:
• Ground air is connected and the Isolation Valve is open.
• Engine no. 1 Bleed Valve is open.
• isolation and Engine no. 2 Bleed Valves are open.
The APU Bleed Valve may be open during engine start, but avoid engine power
above idle thrust.
Operate the APU for one full minute with no bleed air load prior to shutdown.
The APU bleed valve must be closed when:
• Ground air is connected and the Isolation Valve is open.
• Engine no. 1 Bleed Valve is open.
• isolation and Engine no. 2 Bleed Valves are open.
The APU Bleed Valve may be open during engine start, but avoid engine power
above idle thrust.