1) What is 'APM' in the transcript?
Special mobile landing lights on trucks.
Strong spot lights, in this case put on both sides of threshold
to form "bramka", a gate. The ATC claimed, they were at threshold,
the Yak-40 crew suggested to the Tu-154 crew, the were 200m before RW.
Anyway the Yak-40 crew confirmed them working and in good condition.
2) Here's a hand grenade into the room - who was actually 'PIC' on
the approach and even worse, who was actually sitting in the left seat?
The strength of the voice recording and clear readings suggest
that Arkadiusz Protasiuk was speaking directly to the microphone, so
it is highly probable he was in the left seat with head set on.
Any other voices of non crew persons are weak an hardly legible.
They might have been sitting near or at navigator position,
ore even standing in the door, but NOT LEFT SEAT.
And, BOAC,
stop that rubbish !!! 