Jwenting From Netherlands, joined Apr 2001, 10213 posts, RR: 20 Reply 3, posted (8 years 7 months 1 week 3 days 11 hours ago) and read 2979 times:
Another reason is to house the actuators for the stab (similar to the DC-9 series).
And in military service (what both the 134 and 154 were designed for) ECM equipment and possibly other countermeasures can be easily placed in a pod like that, easier than having to dig inside the fuselage for space to string wires for antennas.
Sovietjet From Bulgaria, joined Mar 2003, 2429 posts, RR: 15 Reply 4, posted (8 years 7 months 1 week 2 days 21 hours ago) and read 2907 times:
The Tu-134 "balkany" airborne command post has the special gear at the end of the fuselage. Other special versions do include fairings of sorts on the fuselage but they dont have anything but the radio antenna in the "scorpion sting".
Sovietjet From Bulgaria, joined Mar 2003, 2429 posts, RR: 15 Reply 7, posted (8 years 7 months 1 week 21 hours ago) and read 2638 times:
The Tu-134 "balkany" is a tactical airborne command post the name coming from the Balkany secure HF communications suite that it is fitted with. The 'sting" in the back is identical to the "scorpion tail" on the top of the fin. Also features an extra 4 blade aerials(one on top of fuselage, top of fin, two under rear fuselage). About 40 glass-nosed Tu-134As were converted to Balkany standard and they seat between 26-31 people in VIP configuration. Eventually after the collapse of the USSR some of the Balkanys became obsolete and were reconverted back to passenger configuration just like this one.