Jafferson Posted April 24, 2016 Posted April 24, 2016 I have read the operations manual, but could not find anything about the function of the spare inverter. Is the spare a backup for the main inverter to check only its operational, or is there a reason to turn it on in the shutdown process? Should i run the spare with the 2min idle time, or do not care? :book:
flying rabbit Posted April 24, 2016 Posted April 24, 2016 Do you mean on startup or shutdown? From the huey manual... Inverter Switch. The INVTR switch is located on the AC POWER control panel in the overhead console (fig 2-5). The switch is normally in the MAIN ON position, to energize the main inverter. In the event of a main inverter failure the switch can be positioned to SPARE ON to energize the spare inverter. Electrical power to the INVTR switch is supplied from the essential TM 55-1520-210-10 bus. Circuit protection is provided by the INVTR CONT circuit breaker. b. AC Failure Caution Light. The INST INVERTER caution light will illuminate when the inverter m use fails or when the INVTR switch is m the OFF position. There is a 25min rule or towing the huey: 5-16. Towing. The helicopter should not be towed for 25 minutes after the battery and inverter switches have been turned off to prevent damage to attitude and directional gyros. If the helicopter must be towed prior to the 25 minute limit, the battery and inverter switches shall be turned on. Wait five minutes after the switches are on before moving the helicopter. But thats all.
Jafferson Posted April 24, 2016 Author Posted April 24, 2016 (edited) Yes i mean the shutdown. So ist only a backup if the main Inverter have a failure? Edited April 24, 2016 by Jafferson
flying rabbit Posted April 24, 2016 Posted April 24, 2016 4. INVTR switch OFF - Check for INST INVERTER caution light illumination. Switch to SPARE check caution light OFF. So its just to check if it broke on your flight before you tow it for the next day.
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