FUEL PANEL Flashcards
ENG VALVE CLOSED - light
How many ways to control the Eng Valve and the Spar Valve? [1sp]
(b) What happens if during start you put start lever to idle and the Eng Valve light stays bright?
(c) what powers these valves
[1sp - (a) 2 ways - eng start lever or eng fire switch
(b) disagreement between the start lever position and the valve position - extra: consider if in the sim the engine doesnt start after levers to idle-look up - maybe the eng valve or spar valve didnt open
(c) DC - from the Batt Bus]
Notes.
- controlled by Eng Start Lever or Eng Fire Switch
- during Eng start - they go BRT to OUT
- this valve is the HPSOV on the HMU/FMU
- requires fuel pressure to open
Extinguished: Eng Fuel valve is OPEN
Illuminated (Blue):
- Bright: valve in transit or disagreement (between valve and either Eng Start Lever or Eng Fire Switch)
- Dim: Eng Fuel SOV CLOSED
SPAR VALVE CLOSED Light
What powers this light?
DC powered from the Switched Hot Batt Bus.
Notes.
- controlled by Eng Start Lever or Eng Fire Switch
- during Eng start - they go BRT to OUT
- this valve is mounted on front spar and has backup NICAD battery to ensure it can always close
- this valve shows the position of the spar valve
Extinguished: SPAR valve is OPEN
Illuminated (Blue):
- Bright: valve in transit or disagreement (between valve and either Eng Start Lever or Eng Fire Switch)
- Dim: SPAR SOV CLOSED
FUEL TEMP INDICATOR
- indicates fuel temp in the #1 TANK
- Needs electrical power (AC)
- with no electrical power - the pointer goes off scale (negative side of indicator)
- if you approach freezing point of fuel - consider descending OR increasing MACH number
FILTER BYPASS Lights
What can cause the filter bypass light to come on? (1sp)
Extinguished: fuel filter operating normally
Illuminated (Amber): impending fuel filter bypass (due to a contaminated filter)
[1sp - means the fuel is bypassing the filter - means the filter is dirty, clogged or contaminated - (remember if this light is ON - DO NOT open the crossfield - you do not want to contaminate the other side)]
CROSSFEED SELECTOR and LIGHT
What is the power source for the crossfeed valve? (1sp)
[1sp - DC from the battery bus.]
Notes.
- crossfeed allows single TANK to supply BOTH engines
SELECTOR.
- controls fuel crossfeed valve
- CLOSED: isolated Eng 1 & 2 fuel feed lines
- OPEN: connects Eng 1 & 2 fuel feed lines
VALVE OPEN LIGHT.
- Extinguished: Crossfeed valve is CLOSED
-
Illuminated (blue):
- BRIGHT: in transit or disagreement (with crossfeed selector)
- DIM: Valve is OPEN
LOW PRESSURE Lights - Center Tank
- DUAL CHANNEL / RECALL LIGHT FEATURE
Illuminated (Amber):
- fuel pump output pressure is low (and the switch is ON)
Extinguished:
- fuel pump output pressure is normal OR Fuel Pump switch is OFF
Notes.
- lights are ARMED with pump switch ON
- with BOTH pumps ON - it takes BOTH LOW PRESS LTS to illuminate to trigger a MC & FUEL light
- with only 1 LOW PRESS light - the MC and FUEL will only illuminate on recall
- with 1 CTR pump OFF - if the opposite CTR tank LOW PRESS light illuminates you will get the MC & FUEL LT
- if the center pumps are off = NO LIGHTS
FUEL PUMP Switches (Main & Center)
If this light comes on - what does this mean?
[1sp - pump output pressure is low *
** Remember - if any low pressure light comes on - on either fuel or hydraulics - ALWAYS look at the QTY - no qty - no pressure will let you know if its qty problem or a pump problem]
ON: activates fuel pump (2 pumps per tank) - AC powered
OFF: deactivates fuel pump
Center tank limitations.
- only turn on centers if there is more than 1000# and only if someone on flt deck to monitor
LOW PRESSURE Light - Main Tanks
Notes.
- the MAIN TANK LP lights are ALWAYS armed (unlike CNTR LP lights)
- Pumps are FWD and AFT
- 2 lights in SAME TANK = MC & FUEL
- 1 light in a MAIN TANK = MC & FUEL on Recall only
Illuminated (Amber):
- fuel output pressure is low (or pump is off)
Extinguished:
- fuel output pressure is normal
