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Helios Airways 522

Printed page 37. PDF page 49.

the company frequency, 131.2 MHz. The communications with the Dispatcher Office were not recorded. There was no requirement by Cyprus DCA, JARs or ICAO Annexes for the recording of company communications with airborne aircraft. 1.9.1 Radio Communication Failure After si
Open final report at PDF page 49AAIASB 11/2006: Helios Airways HCY522

Helios Airways 522

Printed page 68. PDF page 80.

cabin altitudes. Therefore, when the aircraft had reached FL340, the cabin altitude was not recorded on the NVM. Based on calculations by Nord-Micro, the final cabin altitude was estimated by extrapolation to have reached approximately 24 000 ft. Based on
Open final report at PDF page 80AAIASB 11/2006: Helios Airways HCY522

Helios Airways 522

Printed page 69. PDF page 81.

pressure controller was not receiving the parameter CAS from DADC#1. This message was not recorded on the ground and did not represent a DCPCS problem or malfunction. Flight Leg 8632 showed the message "2541BIT Entry" which indicated a DCPCS calibration
Open final report at PDF page 81AAIASB 11/2006: Helios Airways HCY522

Helios Airways 522

Printed page 115. PDF page 127.

likely persisted for the last 74 flight legs. Only on the last flight is this situation not recorded, because the Outflow Valve did not modulate to compensate for the outflow of air, since the aircraft's Cabin Pressure Controller Mode Selector
Open final report at PDF page 127AAIASB 11/2006: Helios Airways HCY522

Helios Airways 522

Printed page 135. PDF page 147.

Reports (CDRs) showed flight and duty times that exceeded the approved limits and were not recorded or reported to the DCA. The Board also noted statements that the scheduling of flights was based on unrealistic flight times for some routes
Open final report at PDF page 147AAIASB 11/2006: Helios Airways HCY522

Helios Airways 522

Printed page 152. PDF page 164.

Communications between the flight crew and the company Operations Centre Dispatcher were not recorded; nor was there a regulatory requirement to record such communications. 152
Open final report at PDF page 164AAIASB 11/2006: Helios Airways HCY522