Delta Airlines 2014 Annual Report Download - page 333
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The difference between:
[***]
The A350-900 powered by RR TRENT XWB-
84 engines [***] as defined in Paragraph 1 herein shall be certified in
accordance with the requirements of Chapter 4 of ICAO Annex 16, Volume I, with a [***].
Noise data shall be obtained and evaluated in accordance with the requirements of Appendix 2 of Third Edition of
ICAO Annex 16, Volume I.
At a pressure altitude of [***], the guaranteed A-
weighted Sound Pressure Level (SPL) and the SIL (as defined in
Paragraph 5.6 herein) shall be as follows:
Noise levels shall be measured at the Captain’s and First Officer’
s seat position at head level with normal cockpit air
conditioning and ventilation in operation.
At a pressure altitude of [***]:
Noise levels shall be measured at a height of 40 inches (1.0m) above the passenger compartment floor on the aisle
center lines in the passenger seating area.
[***] CONFIDENTIAL PORTION OMITTED AND FILED SEPARATELY WITH THE COMMISSION PURSUANT TO
A REQUEST FOR CONFIDENTIAL TREATMENT
3
USABLE LOAD
4
SOUND LEVELS
4.1 Exterior Noise -
Acoustic Certification Levels
4.2
Interior Noise During Flight
4.2.1
Cockpit
[***] [***]
[***] [***]
[***] [***]
4.2.2
Cabin
[***] [***]
[***] [***]
[***] [***]
5
GUARANTEE CONDITIONS