The Harrison note differ as well. the manual transcripts stamp a time of 8:52 with Cooper's last communication at 55 minutes. Harrison has it documented at 9:00 which makes sense with the 55 minutes. then we have several references of the famous 23 miles DME from Portland. you would hope to find an 8 minute gap but instead find a 4 minute gap with other reports. he writes twice 8:22 but in the last record of events he writes 8:18. Harrison writes a time of 9:52 with 305 being 58 miles DME from RBL Vor. the transcripts report 10:05 giving a 13 minute gap.
R99, any input..I realize the teletype will have a delay but will the timing differ with each transmission?
Dfs, can you post the entire interveiw?
The MOCA (Minimum Obstacle Clearance Altitude) and the MCA (Minimum Communications Altitude) for the segment of V-23 south of Portland are both 10,000 feet ASL. The MCA refers to communications with Air Traffic Control sites and not to the ARINC sites.
The "FBI Notes" state at 9:42 PM PST direct communications with the airliner through the ARINC radio patch and teletype system were not possible at that time. Instead, UAL 4331 and WAL 328, who were apparently flying high enough to still be in communication with the ARINC system, relayed communications between the hijacked airliner and the ARINC system which were then passed to NWA stations in Seattle and Minneapolis.
Consequently, there would be a greater delay between reporting the location of the airliner and that information being received by NWA stations than if the airliner itself was in direct contact with an ARINC station. Also, the time would vary depending on the work load on the ARINC system and the length of the messages.
The FBI Notes also state that the airliner was told to contact the SFC (San Francisco) ARINC station at 10:30 PM PST. See these notes as well as the Oakland ATC Center transcripts for more information on this and the above. Remember that the airliner was switched to the Oakland ATC Center at 8:45 PM PST.