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1.) What is required for the SAAB to be dispatched into know icing conditions? 11-1
All ice protection systems must be operable
2.) Can the SAAB be dispatched into icing conditions with side windshield INOP? 11-1
No, all systems must be operable
3.) Which electrical ice protection system is NOT powered by the AC Generator? 11-2
Standby Pitot heat
4.) What powers the Standby Pitot heat? 11-2
Right Essential Bus
5.) How long does it take for the standby pitot to reach full operating temperature? 11-2
At least 5 minutes
6.) What is powered automatically when the 1st AC GEN comes online? 11-3
Main Pitot tubes, temp probe, AOA vanes
7.) What is the power source for the OAT probe? 11-5
115 V AC generator
8.) Is there a pilot controlled switch for the OAT Probe heating? 11-5
No
9.) When is the OAT probe heated? 11-5
From the time the gear is retracted till landing
10.) When is power supplied to the AOA vanes for heating? 11-6
As soon as an AC Generator is online
11.) What is the power source for the windshield heat? 11-7
115 Volt “wild” frequency bus
12.) What powers the 115 Volt “wild” frequency bus? 11-7
AC Generator
13.) What is the time limit for side windshield heating? 11-8
Operate in NORM for 7 minutes before selecting HIGH
14.) What is indicated by an illuminated L/R SIDE or L/R FRONT lights? 11-8
Either an overheated windshield or a controller fault
15.) If power is interrupted to a windshield causing a FRONT/SIDE light to illuminate, will the light extinguish when power is restored? 11-8
No, the switch must be turned off and then back on again to reset the system
16.) What does the AIR SUPPLY switch control? 11-10
Controls a shut off valve to allow bleed air to the boot system
17.) What stage does the bleed air for engine anti-ice come from? 11-10
5th stage
18.) When deflated what holds the boots “down” tight to the wing? 11-10
Vacuum pressure
19.) What items use Bleed Air for Ice protection? 11-10&13
Boot De-Icing, Engine split lip, engine guide vanes
20.) What order are the boots cycled in one cycle? 11-10
Stab, outboard wing, inboard wing, stab
21.) Will the deice boots inflate with both bleed valves closed? 11-10
Yes
22.) Will boots inflate with H/P valves closed? 11-10
Yes
23.) Can boot inflation be monitored? 11-10
Yes, by watching the boot indicator lights
24.) How often are the boots cycled when operating in “CONT”? 11-10
Every 3 minutes
25.) Does the CWP ICE PROT light illuminate with all the Icing systems?
Yes
26.) What is indicated by an illuminated DE-ICE OV TEMP light? 11-10
An over temperature has been noted in the boot system (>150ºC)
27.) What is indicated by an illuminated TIMER light? 11-11
The de-ice timer valves are malfunctioning
28.) Can the pilot manually de-ice just the wings? 11-11
Yes
29.) Can the pilot manually de-ice just the stabilizer? 11-11
Yes
30.) How can the pilot de-ice just the outboard wing section? 11-11
By pressing and holding the outboard push button for 6 seconds
31.) Why are HP valves kept in AUTO during flight in icing conditions? 11-11
To insure proper boot inflation at low power settings
32.) What is indicated by an illuminated blue ENG ANTI-ICE light on the status panel? 11-13
The associated Engine Intake switch is on
33.) Does the blue ENG ANTI-ICE status panel light extinguish with a failure of the Intake heat? 11-13
No
34.) Which light on the status panel does NOT indicate system working properly? 11-13
Engine Anti-Ice
35.) Which ice protection system can not be transferred to the opposite side AC GEN? 11-13
Engine intake heat
36.) How is the inlet lip heated? 11-13
Electrically
37.) How are the inlet frame vanes heated? 11-13
Engine oil
38.) How is the splitter lip and guide vanes heated? 11-13
Bleed air
39.) What controls bleed air to the splitter lip and guide vanes? 11-13
Anti-Ice start bleed valve (AISBV)
40.) What is indicated by an illuminated L AIR VALVE light? 11-14
Associated Air valve is not positioned properly
41.) What is indicated by an illuminated INTAKE light? 11-14
Intake heat has failed or lost one or more phases
42.) Is prop ice protection used as a de-ice or anti-ice system? 11-15
De-Ice
43.) When is Prop De-Ice turned on? 11-16
When ice accretion is observed and SAT is -5ºC or colder
44.) What temperatures is NORM used for prop de-ice? 11-16
-5ºC to -12ºC
45.) At what temperature does prop de-ice switch to MAX? 11-16
Colder than 12ºC with ice accretion
46.) Why is it important to operate the props only after ice accretion? 11-16
To avoid “run back” ice
47.) What is “run back” ice? 11-16
Ice that melt and refreezes on the unheated section
48.) How much thrust is lost with “run back” ice on the props? 11-16
Up to 30 percent of thrust
49.) Can the MAX mode be used between temperatures of -5ºC and -12ºC? 11-16
Yes if propeller vibrations occur MAX can be used up to -10ºC until vibrations dissipate
50.) What is the procedure for switching from NORM to MAX on prop heat? 11-16
Turn switch off before switching to MAX to avoid nuisance cautions
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