Bell 412EP
hi all,
my questions are: 1. in 'emergency load' mode, why does AP2 remain available? would it be the same if AP1 remained available and not AP2? ANS 1: no difference..ap2 remains on cz emergency bus 1 powers up inv 1 and inv 1 powers up AP2.. 2. if eng no2 overspeeds, say its n2 103 %. no1's n2 is 100%. now the Nr (rotor RPM) would match no1's n2 as per the maintenance manual. how would the clutch (the free wheeling device) allow the low RPM (100%) to be matched with Nr against a higher RPM (103%).. |
2. At full throttle setting the engines are N2 governed not NR governed. The rotor would be at 103%, #1 N2 at 100% and #2 N2 at 103%.
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1. in 'emergency load' mode, why does AP2 remain available? ANS 1: no difference..ap2 remains on cz emergency bus 1 powers up inv 1 and inv 1 powers up AP2. 2. if eng no2 overspeeds, say its n2 103 %. no1's n2 is 100%. now the Nr (rotor RPM) would match no1's n2 as per the maintenance manual. how would the clutch (the free wheeling device) allow the low RPM (100%) to be matched with Nr against a higher RPM (103%). |
AP2 is on the Captains side but the reason it stays on is because Number 2 inverter is lost when emergency load is used. AP's are powered by the opposite side inverters. IE AP1 - inverter 2/ AP2 Inverter 1
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412EP Offshore range
I dont have the manuals so can anyone with a few minutes going spare tell me the range (at 120) of a typical offshore spec EP at SL, ISA, 12 pax and IFR fuel?
(alt is a 180 back to shore) I will be getting tested later on :D |
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