Polish Presidential Flight Crash Thread

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About Smolensk Severnyj approach systems

Russian generic approach types are listed in pictorial file: ”ApproachTypes.pdf” (sometimes loadable)...:

Рассмотрим 10 типов захода (хотя их можно придумать и больше)...

1. Заход по КГС в режиме ПСП. (typical minimum: CATI – 60x800 or 60x550)
2. Заход по КГС в директорном режиме. (CATI – 60x800 or 60x550)
3. Заход по КГС в автоматическом режиме. (depends on cat, can be CATIIIB – 0x50)
4. Заход по ОСП. (120x1500)
5. Заход по ОСП с использованием ОРЛ-А. (120x1500)
6. Заход по РСП. (Radar APP, 60x800)
7. Заход по РСП + ОСП. (60x800)
8. Заход по ОПРС. (one separate NDB) (200x2000)
9. Заход по VOR/DME. (100x1000 or 250x2500)
10. Заход визуальный. (Visual) (200x2000)

ОСП = 2 xNDB (non-directional beacons, LF/MF) (DPRM + BPRM) - 2xARK (= ADF) required.

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Smolensk-Severnyj (XUBS) IAC-chart RWY26 (dated 12Apr2005), most probably obsolete but gives:

ОСП РСП РМС 15п
РСБН 13н

which means there is (have been at least):
-- 2xNDB plus radar (#7 above)
-- RSBN (ch 13) for positioning in “Krug” (rectangular circuit), to be coupled with PRMG (ch 15) for precision electronic course + GP
(these both are Soviet UHF type systems now in big problems internationally as they are conflicting with mobile phones - PRMG is pure a Mil-type landing system, seldom even directly mentioned).

РМС in this case is a special way to introduce a “radiomayachnaya” landing system.
No mention in IAC chart of ОРЛ-А -- Airport Surveillance Radar (part of РСП?).

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Mention of “markers” in this case is hardly appropriate, since marker ground antennas seen in Amelin et al photos most probably are part of PRMG (not any “ILS” type). While with carrier fq of 75 MHz, PRMG markers are differently audio modulated: outer MKR = 3000Hz dashes, while middle MKR = 3000 Hz dots. So, using Jeppesen type LMM & LOM not very appropriate.

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In “Stenogramma 101” the “beep sound” 845 Hz (10:39:50,2) = DPRM id (OK 310), while 800 Hz (10:40:56,0) = BPRM id (O 640).

Several typing and other errors corrected ... dont wish to interfere nice discussions in any way....