Originally Posted by
chevvron
I don't know; the inclusion of ASRs on the IFR chart might indicate that the TA is very high or even that at the time of printing, ISA hadn't even been adopted.
In the Varsity nav trainer the rear crew altimeter had the ability to set SPS (1013.2) but not QFE or QNH. Before take-off we would zero the altimeter giving us an effective QFE. Passing transition we would reset the altimeter by adjusting the setting until a white line was aligned which gave us 1013.
On descent to base we had no direct means of resetting to QFE, nor were we taught to calculate the difference between SPS and QFE and adjust the altimeter by the appropriate number of feet.
Not quite sure why but In those days, 1962, our navigation ceased at the entry point some 15 miles from base when we were picked up for an ACR7 approach. Our base had no nav aids except the pundit.