US Airways 2007 Annual Report Download - page 552

6.1 Compliance with the Guarantees shall be demonstrated using operating procedures and limitations in accordance with those defined by the certifying
Airworthiness Authority and by the Seller unless otherwise stated.
6.2 Compliance with the take-off, second segment and landing elements of the Guarantees will be demonstrated with reference to the approved Flight
Manual.
6.3 Compliance with those parts of the Guarantees defined in paragraphs 1 and 2 above not covered by the requirements of the certifying Airworthiness
Authority shall be demonstrated by calculation based on data obtained during flight tests conducted on one (or more, at the Seller's discretion) A321
(CFM Powered) aircraft of the same aerodynamic configuration as those New A321 (CFM Powered) Aircraft purchased by the Buyer and incorporated
in the In-Flight Performance Program and data bases (the "IFP") appropriate to the New A321 (CFM Powered) Aircraft.
6.4 Compliance with the Manufacturer's Weight Empty guarantee defined in paragraph 3 shall be demonstrated with reference to a weight compliance
report.
6.5 The approved aircraft flight manual shall be used to demonstrate compliance with the certification noise levels guarantees (paragraph 4.1.1).
6.6 FAA Advisory Circular 36-3H dated 25 April 2002 shall be used to demonstrate compliance with the guarantee in paragraph 4.1.2.
6.7 The Airbus Noise Level Computation program will be used to demonstrate compliance with the guarantee in paragraph 4.1.3.
6.8 Compliance with the interior noise guarantees shall be demonstrated with reference to noise surveys conducted on one (or more) aircraft at the Seller's
discretion of an acoustically equivalent standard to those A321-211 aircraft purchased by the Buyer. Data derived from flight tests and noise surveys
shall be adjusted as required using conventional methods of correction, interpolation or extrapolation in accordance with established aeronautical
practices.
6.9 Compliance with the Guarantees is not contingent on engine performance defined in the engine manufacturer's specification.
** Confidential Treatment Requested.
USA — Amended and Restated Airbus A320 Family Purchase Agreement LA 8F-1 — 18 of 22
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