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Figure 1 AGAG Validity : Standard 23-11-00Page 2 (BE) DEC 99 VHF CAPABILITY DESCRIPTION AND OPERATION 1. GENERAL (Figure 1) The optional VHF capability system allows operating the radiocommunication means (VHF) as well as the radionavigation messages (VOR, DME, ADF and MKR). The system consists of : — an A50 audio control box, — a cabin loudspeaker, — connecting jacks, — push—to—talk switches on R.H. and L.H. control wheels, — a hand—held microphone. The system receives audio signals from : — COM 1 installation (if installed) — refer to 23-12-00, — COM 2 installation (if installed) — refer to 23-13-00, — COM 3 installation (if installed) — refer to 23-14-00, — the Marker system (if installed) — refer to 34-31-00, — the NAV 1 installation (if installed) — refer to 34-51-00, — the NAV 2 installation (if installed) — refer to 34-52-00, — the automatic direction finder system (if installed) — refer to 34-54-00, — the DME installation (if installed) — refer to 34-55-00. The system receives unmuted audio signals or warning tones from : — the global positioning system (GPS) (if installed) — refer to 34-57-00, — the altitude / vertical speed selector (if installed) — refer to 22-12-00, — the aural warning unit (landing gear—stall) only for aircraft equipped with retractable landing gear — refer to 31-50-00. The A50 audio control box includes also a marker beacon receiver — refer to 34-31-00. The A50 audio control box is electrically supplied by "BUS 1" and "BUS 3" bars. ACAD Validity : KMA 24 — 02 without interphone 23 11-00Page 1 (BI) DEC 99 , 0 Lu CC Aodt a I) O0 0 Co < w O m I-Z < 0 M mO 0 0 W CZ. UJ "I 0 co O 0 4 V v VHF capability — Electrical schematic Figure 1 ACAD Validity : KMA 24 — 02 without interphone 23-11 Page 2 00 (BI) DEC 99 2. LOCATION (Figures 2 and 3) COMPONENT QTY AREA ACCESS DOOR REFERENCE A50 audio control box 1 251 C / 23-10-00 Cabin loudspeaker 1 240 / 23-11-00 Pilot connection jacks / 236 / 23-11-00 R.H. front station connection jacks / 236 / 23-11-00 Hand—held microphone 1 236 / 23-11-00 Circuit breaker : — "Audio" 2 230 232L WM 中国通航网 www.ga.cn 通航翻译 www.aviation.cn 本文链接地址：TB20 MAINTENANCE MANUAL 23 COMMUNICATIONS TB20飞机维护手册 通讯(12) |
