Environmental Systems & Anti-Ice Flashcards
Bleed air (at TRT) normally doesn’t exceed…
600 degrees F, 125 psi
AIR COND FAIL annunciator & ACU will shut down if exit air temp exceeds ___ F, or compressor inlet pressure exceeds __ psi
400, 53
CABIN AIR OV HT illuminates at
390 +/- 15 degrees F in cabin vents
The _ switches in aft compartment will trigger BL AIR DUCT FAIL at ___ F (or an anti-ice problem)
4; 350
(Pressurization) How many outflow valves?
2
Bleed air pressure to cabin door seal
15 psi
Cabin rate of climb is adjustable between __ ft and ____ ft
50 to 2000
CABIN PRESSURE HI illuminates
11 +/- 1 psid
Outflow valves should keep cabin differential pressure from exceeding…
9.1 psid
CABIN PRESSURE LO illuminates
9,500 +/- 500 ft cabin altitude
With cabin outflow valve at full decrease, cabin altitude may climb as high as
12,500 +/- 500 ft
Prolonged use of EMER pressurization can…
melt trim panels, lead to smoke and fumes
When throttles are advanced to T/O, cabin pressurizes approx
80 to 120 feet
How many evaporator blower units are in the cabin?
3 (fwd, aft, and avionics - not counting stby avionics)
AV BLO FAIL
lack of pressure from the avionics blower
The VCCS (vapor cycle cooling system) is located…
in the aircraft nose
VCCS is auto depowered if (3 conditions):
1) engine start. 2) windshield heat. 3) horiz. stab. anti-ice/de-ice
The only possible power source for electrical heat is…
ground power unit
How many electrical heater elements are there?
3
Bleed air switch must be in the ___ position to use “ground air”
OFF
ICING illuminates when the detector senses ___ inches of ice
0.020
The ice detector heating/sensing cycle is ____ seconds
50-70
Apply engine anti-ice ____ entering icing
before
L/R ENG ICE TEMP LO
< 120 degrees F
Don’t operate engine anti-ice on the ground at temperatures above __ C except for test.
10
Bleed air for wing anti-ice is regulated down to ____ psi
38-44
Wing anti-ice operation light illuminates
11 psi in the anti-ice system
WG ICE TEMP LO
< 140 degrees F
WG OV HT
2 switches at 212 F, 1 at 350 F
BL AIR DCT FAIL
pressure increase of 3.5 +/- 0.5 psi
Icing on descent? Don’t use 30 flaps unless (2 scenarios)
1) RAT reaches 10 C on descent. 2) Less than 10 minutes in icing and RAT was warmer than -8 C
Horiz. stab anti-ice elements are maintained at ____ degrees F
260-280 F
The horiz. stab. de-ice has __ zones
12
A complete cycle of the horiz. stab. de-ice zones takes
approx 3.5 minutes
If horiz. stab. anti- or de-ice fails…
turn off both & activate de-ice backup
STB ANTI ICE FAIL
310 degrees F, or current sensor failure
STB DE ICE FAIL
malfunction in current sensor, heater mat, or sequence timer
For horiz. stab. de-ice backup, the switch must be held to “manual” every _ minutes
2
“Manual” position on horiz. stab. de-ice backup switch activates heat for ____ seconds
30
PITOT HEAT OFF
One of the pitot heat systems is off or has failed
L/R WSHLD OV HT
approx. 130 degrees F (should go out at 115)
Windshield wiper max airspeed
200 KIAS
Windshield heat must be ON above ____ ft
18000
HIGH windshield heat causes _____ and _____ mag compass
erratic and unreliable
If one pilot is out of the seat above FL ___, the other pilot must have oxygen on.
350
How much oxygen does the cylinder hold?
77 cubic feet
When is the oxygen “operationally empty”?
10% of rated capacity / 200 psi
A temperature drop of 100 degrees F will drop oxygen pressure by ___ %.
20
The green oxygen discharge indicator will blow out at what pressure?
2700 psi
How many passenger masks does the T-1 have?
7
Minutes of oxygen on-board ____ from _____ ft to _____ ft, then ____ from ____ ft to _____ ft
declines; 10,000; 25,000; rises; 25,000; 41,000
Oxygen isn’t available to anyone unless…
SYS READY knob is pulled
The redline pressure on the oxygen gauge is
2000 psi
