US Airways 2007 Annual Report Download - page 1142

7 GUARANTEE CONDITIONS
7.1 The performance and noise certification requirements for the Aircraft, except where otherwise noted, will be as stated in Section 02 of the Specification.
7.2 For the determination of FAR take-off and landing performance a hard dry level runway surface with no runway strength limitations, no line-up
allowances, no obstacles, zero wind, atmosphere according to ISA, except as otherwise noted, and the use of centre of gravity positions, speed brakes,
flaps, landing gear and engines in the conditions liable to provide the best results will be assumed.
7.2.1 When establishing take-off and second segment performance no air will be bled from the engines for cabin air conditioning or anti-icing.
7.3 Climb, cruise and descent performance associated with the Guarantees will include allowances for normal electrical load and for normal engine air
bleed and power extraction associated with cabin differential pressure as defined in Section 21-30.31 of the Specification. Cabin air conditioning
management during performance demonstration as described in Subparagraph 8.3 below may be such as to optimise the Aircraft performance while
meeting the normal air conditioning requirements defined above. Unless otherwise stated no air will be bled from the engines for anti-icing.
Cruise performance at 20,000 ft and above is based on an optimized centre of gravity position.
7.4 The engines will be operated using not more than the engine manufacturer's maximum recommended outputs for take-off, maximum go-round,
maximum continuous, maximum climb and cruise for normal operation unless otherwise stated.
7.5 Where applicable the Guarantees assume the use of an approved fuel having a density of 6.7 lb per US gallon and a lower heating value of 18,590 BTU
per lb.
7.6 Speech Interference Level (SIL) is defined as the arithmetic average of the sound pressure levels in the 1000, 2000 and 4000 Hz octave bands. A-
Weighted sound pressure level (dB(A)) is as defined in the American National Standard Specification ANSI.4-1971.
7.7 All guaranteed interior noise levels refer to an A350-900 XWB Aircraft with standard acoustic insulation and an interior completely furnished. The
effect of Buyer furnished equipment other than leather passenger seats (leather seats or acoustically equivalent) will be the responsibility of the Buyer
(Remark: Standard seats tend to decrease interior noise levels by 1-2 dB)
7.8 For purposes of the sound levels guaranteed in Clause 5.2.1.2 of this Letter Agreement, the APU and air conditioning system will be operating. Sound
level measurements may be made at the prevailing ambient temperature with the air conditioning packs controlled to approximate air conditioning
machinery rotational speed appropriate to an ambient temperature of 25C.
** Confidential Treatment Requested.
USA — Amended and Restated A350 Purchase Agreement LA 8-2.B — 12 of 16
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