US Airways 2007 Annual Report Download - page 775

4.2.1.1 Cabin
During ground operation, with the APU and the air conditioning in normal operation and passenger doors open or closed, the guaranteed A-weighted
Sound Pressure Level (SPL) and the Speech Interference Level (SIL) in the passenger seated area will be as follows:
Guarantee
SPL [dB(A)] **
SIL [dB] **
Noise levels will be measured at a height of ** above the passenger compartment floor on the aisle center lines in the passenger seated area.
4.2.2 Interior Noise in Flight
4.2.2.1 Cockpit
At a pressure altitude of ** and a true ** in straight and level flight in still air under ISA conditions, the guaranteed A-weighted Sound Pressure Level
(SPL) and the Speech Interference Level (SIL) will be as follows:
Guarantee
SPL dB(A)] **
SIL [dB] **
Noise levels will be measured at the Captain's and First Officer's seat position at head level with normal cockpit air conditioning and ventilation in
operation.
4.2.2.2 Cabin
At a pressure altitude of 35000 ft and a true Mach number of ** in straight and level flight in still air under ISA conditions, the guaranteed A-weighted
Sound Pressure Level (SPL) and the Speech Interference Level (SIL) will be as follows:
Guarantee
SPL [dB(A)] **
SIL [dB] **
LA 8C — 4 of 9
USA — Airbus A330 Purchase Agreement
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