US Airways 2007 Annual Report Download - page 895

2.1.3 Manufacturer Specification Change Notice
The Specification may also be amended in writing by the Seller by a Manufacturer's Specification Change Notice. Each MSCN will be substantially in the
form set out in Exhibit B-2 and will set out the MSCN's effectivity and the particular change to be made to the Specification and the effect, if any, of such
change on design, performance, weight, Scheduled Delivery Month of the Aircraft affected thereby, interchangeability or replaceability requirements of
the Specification and text of the Specification. MSCNs will be subject to the Buyer's acceptance, except in the case of Development Changes (as defined
below) or changes resulting from Airworthiness Directives, government-mandated regulations arising after the date of the Specification or equipment
obsolescence.
2.1.4 Development Changes
As stated in Clause 2.1.3, changes may be made by the Seller without the Buyer's consent when changes to the Aircraft do not adversely affect price,
Scheduled Delivery Month, weight of the Aircraft affected thereby, **interchangeability requirements or replaceability requirements of the Specifications
of the Aircraft affected thereby are deemed by the Seller to be necessary to improve the Aircraft affected thereby, prevent delay or ensure compliance with
this Agreement ("Development Changes"). Development Changes will be made by either an MSCN or a manufacturer's information document prior to
Delivery of the relevant Aircraft.
2.2 Customization Milestones Chart
Within a reasonable period after signature of this Agreement, the Seller will provide the Buyer with a chart called the "Customization Milestones Chart,"
defining the lead times before Delivery needed for agreeing on items requested by the Buyer from the Standard Specifications and Configuration Guides
CD-ROM.
2.3 Propulsion Systems
Each Airframe will be equipped with a set of Propulsion Systems. Each Airframe will be equipped with nacelles and thrust reversers.
**Confidential Treatment Requested.
USA — Amended and Restated Airbus A350 XWB Purchase Agreement PA – 17 of 109
EXECUTION PRIVILEGED AND CONFIDENTIAL