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Helios Airways 522

Printed page 62. PDF page 74.

hypoxia with Australian Army helicopter aircrew who had operated at altitudes up to 10 000 ft. The most commonly reported symptoms were difficulty with calculations (45%), light-headedness (38%), delayed reaction time (38%), and mental confusion (36%). Non-pilot aircre
Open final report at PDF page 74AAIASB 11/2006: Helios Airways HCY522

Helios Airways 522

Printed page 67. PDF page 79.

a) At an aircraft altitude of 12 500 ft, the cabin altitude was 10 000 ft. The aircraft rate of climb was 2 939 ft / min and the cabin rate of climb was 2003 ft / min with a
Open final report at PDF page 79AAIASB 11/2006: Helios Airways HCY522

Helios Airways 522

Printed page 71. PDF page 83.

Differential Outflow Valve Aircraft Rate of Climb altitude altitude Pressure Angle 12 100 ft 10 000 ft 1.0 psi 14.54� 2 500 ft/min 18 200 ft 14 600 ft 1.0 psi 14.54� 2 500 ft/min 34 000 ft 26 600
Open final report at PDF page 83AAIASB 11/2006: Helios Airways HCY522

Helios Airways 522

Printed page 72. PDF page 84.

500 ft/min and the cabin followed at almost the same rate. The aircraft leveled off at 10 000 ft, where the cabin altitude reached 8 000 ft. Up to that moment, the cabin differential pressure did not exceed approximately 1.2
Open final report at PDF page 84AAIASB 11/2006: Helios Airways HCY522

Helios Airways 522

Printed page 83. PDF page 95.

Chief] makes the ON respective announcement Passing minimum C/As only allowed to stand 10 000 Ft P/A from Commander "Cabin attendants released" and preparation of the service can begin 83
Open final report at PDF page 95AAIASB 11/2006: Helios Airways HCY522

Helios Airways 522

Printed page 104. PDF page 116.

the Cabin Altitude Warning horn sounded, signaling that the cabin pressure had reached 10 000 ft. The crew silenced the warning and, having already reached FL110, they requested a descent to FL100, where they continued the checklist. While performing the
Open final report at PDF page 116AAIASB 11/2006: Helios Airways HCY522