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1.9.2
1.9.2.1
VHF communications with Anchorage CD/TWR/APP
Communications regarding ATC clearances took place with Anchorage CD/TWR_and APP between 12:50 and 13:05 hours. At 13:05 hours Anchorage APP instructed KE 007 to contact Anchorage ARTCC on 125.7 MHz. This frequency was that of the Kenai remote control air-ground (RCAG) facility.
1.9.3
VHF communications with Anchorage ARTCC
1.9.3.1
At 13:27 hours Anchorage ARTCC terminated the radar service for KE 007 and instructed the flight to contact them on 125.2 MHz, the frequency of the Bethel RCAG. KE 007 used this frequency for communication with Anchorage ARTCC until 13:50 hours when it was directed by the ARTCC to change to 127.8 MHz, the frequency of the St. Paul RCAG, when reporting NABIE.
1.9.3.2
There was no indication of difficulty in establishing or maintaining communication with KE 007 until 14:32 hours. Between that time and 14:34 hours Anchorage ARTCC called KE 007 and although some unintelligible signals were received, contact could not be made. At 14:35 hours KE 015 relayed KE 007's position report for NABIE. In response Anchorage requested KE 015 to instruct KE 007 to make its next position report on 128.2 MHz, the frequency for Shemya RCAG. This request was acknowledged by KE 015 but KE 007 did not establish any further direct VHF contact with Anchorage. Between 16:00 and 16:10 hours KE 015 relayed a position report from KE 007 for NEEVA and acknowledged clearances issued by Anchorage ARTCC for relay to KE 007. KE 015 communicated with KE 007 on 123.4 MHz.
1.9.4
HF communications with Anchorage Radio
1.9.4.1
Beginning at 16:04 hours, KE 007 tried to establish contact with Anchorage Radio. Although several calls were recorded they were weak and apparently not heard by Anchorage Radio. While another aircraft was transmitting a message, KE 007 initiated another call which was not answered by Anchorage Radio. At 16:22 hours KE 007 established contact with Anchorage Radio for a radio check on 5628 kHz. The radio check was effected but the transmission was difficult to read. At 17:08 hours KE 007 again called Anchorage Radio but no reply was received. KE 007 then called Tokyo Radio on the same frequency.
1.9.5
1.9.5.1
Communications with Tokyo
At 17:09 hours KE 007 contacted Tokyo Radio on 5628 kHz to make a position report and was given 10048 kHz as a secondary frequency. A Selcal check was made at the request of KE 007.
1.9.5.2
At 18:15 hours KE 007 contacted Tokyo Radio and requested FL 350. At 18:20 hours KE 007 was cleared to climb to and maintain FL 350. At 18:23 hours KE 007 reported that it had reached FL 350.
1.9.5.3
At 18:27 hours KE 007 again called Tokyo Radio. The message, the last recorded transmission of KE 007, was not understood as it was noisy, garbled and weak. Tokyo Radio requested KE 007 to make a radio check on 10048 kHz. No reply was received and repeated voice and Selcal