Seem to recall in the 70's the A.N.O. 28 allowance was worth about an extra $400 a year.
1000 hours in PNG and operate in at least 3 or 4 areas including highlands to qualify?
Section-28 as mentioned earlier in here, Ray Mac was waiting with Jasper M on an airstrip for the WX to clear (rather similar to the Yalumet picture) when yours truly arrived dumped off pax and buggered off again. I never even noticed two white guys sheltering on the strip
Very impressed he was