EXTERNAL
PNEUMATIC
PORT

INLET A/I
A 16% loss of MTA is realized when engineExtendedAllows import of air from an
VALVE& engine inlet A/I is activated (loss is realizedexternal air source (GPU or
CONTROL
only on the engine being anti-iced, there is no
TS
Range
other helicopter).
exchange of bleed air between engines
ENGINE ANTI-ICE
Fuel
for anti-ice purposes)
START RELAY
#1
(disables inlet
Allows export of air to another
System
O
AMBIENT
A/Iduring start)
opens AISBVUse of bleed air to pressurize
F
helicopter (buddy hose opens
#1 ENG INLET#1 ENG
AIR SENSOR
(removes ele. pwr.)
ANTI-ICE ON check valve when inserted)
external tanks is not significantANTI-ICE ON allows inlet A/I valveF
PORT
to open (removes ele. pwr.) ON
enough to consider loss of MTA.
#1 AISBV is open illuminates light when inlet
is receiving P-2.5 (hot air). INLET A/I VALVE CONTROLTemp. Switch (thermistor)
When A/I switch is on, valve opens/closes IAW ambient temp:
4 deg. C or colder valve should open, 13 deg C or warmer valve should
close, between 4-13 deg. C valve may be open or closed.

(protects fiberglass inlet from heat damage)
At ambient temperatures of 4o C and colder, failure of the ENG ANTI-ICE ON advisory to illuminate indicates a system malfunction.  With the NO.2 ENG ANTI-ICE switch in the ON position, the No.2 Engine Anti-Ice system failed to function properly (#2 ENG ANTI-ICE ON light illuminated but the #2 ENG INLET ANTI-ICE ON light did not illuminate).
(3)
 At temperatures between 4o C to 13o C the ENG INLET ANTI-ICE ON advisory may or may not appear.  Above 13o C appearance of the ENG INLET ANTI-ICE ON advisory indicates a system malfunction.  With both ENG ANTI-ICE switches in the ON position, the No.1 Engine Anti-Ice system is functioning properly (#1 ENG INLET ANTI-ICE ON light extinguished), however the No.2 Engine Anti-Ice system is not functioning properly (#2 ENG INLET ANTI-ICE ON light remained illuminated).

NOTE: A malfunctioning engine anti-ice and engine inlet anti-ice system may result in power losses as much as 40% MTA at 30-minute TGT demands.  If any part of the engine inlet anti-ice check fails, do not fly the helicopter.

(4)
 At ambient temperatures of 4o C and colder, when the NO. 1 or NO. 2 ENG ANTI-ICE switch is placed in the ON position, the corresponding ENG ANTI ICE ON advisory light will illuminate.  Activation of the corresponding ENG INLET ANTI ICE ON advisory light indicates that inlet anti-icing is being provided and the fairing temperature is at 93o C.  At ambient temperatures of 4o C and colder, failure of the ENG INLET ANTI-ICE ON advisory to illuminate indicates a system malfunction.  At temperatures between 4o C to 13o C the ENG INLET ANTI-ICE ON advisory may or may not appear.  Above 13o C appearance of the ENG INLET ANTI-ICE ON advisory indicates a system malfunction.
　
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