Hi SL,
That airplane had -15s,
I've got a few hundred hours operating that airplane for Australian Airlines '87 to '92, based in Melbourne.
The only pax B727s I knew of with the -17s were the Kuwaiti ones, three RPT pax airplanes, and one VIP airplane.
I also have several hundred hours on those.
When they were 'sold' to Syrian Air in '94, I was part of the crew that delivered them to Damascus, and carried out the upgrade training for the Syrian Captns and FEs.
A bit 'off question' I know, but I just had to!
Cheers...FD...