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11 Cards in this Set
- Front
- Back
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The aircraft fuel system consists of?
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1. lines from two interchangeable main fuel tanks
2. firewall-mounted fuel selector valves 3. prime/boost pump, and engine driven boost pumps. |
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How is fuel from the main tanks provided?
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Fuel from the main tanks is by design provided by the low-pressure suction engine
driven boost pumps, resulting in a negative pressure in the fuel lines. -3 to -6 PSI |
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Besides negative pressure how else is fuel provided from the fuel tanks to the engines?
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Two electrically
operated submerged boost pumps provide positive pressure fuel (25 psi) from the main tanks. |
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What is automatic engine fuel prime feature?
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1. An automatic engine fuel prime feature is activated during engine start and stops
when the engine starter drops out. 2. During single engine starts with the engine fuel system selector in cross feed the automatic prime feature is unable to prime the engine being started. |
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When does the fuel low caution and master caution flash?
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FUEL LOW caution light(s) flash and the MASTER CAUTION light on the Master
Warning Panel flashes when the fuel in the respective cell reaches approximately 172 pounds. |
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Description of fuel tanks
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1. Fuel tanks are crashworthy and ballistic-resistant.
2. The fuel line network includes self-sealing, breakaway valves, and all main engine fuel lines are self-sealing at the fittings. 3. The APU fuel lines are not self-sealing. |
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The Fuel System Selector Levers allow:
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DIR - Fuel is drawn to the respective engine (#1 fuel tank to #1 engine,
and #2 fuel tank to #2 engine). XFD - Allows the engines to draw fuel from the opposite tank (#1 engine draws fuel from the #2 fuel tank, and #2 engine draws fuel from the #1 fuel tank). OFF - Fuel to the main engines is shut off (valves closed). APU is drawn from the #1 fuel cell ONLY. |
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The engine fuel supply system consists primarily of?
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1. The low pressure suction
engine driven boost pump, 2. Fuel filter, fuel filter bypass valve, fuel pressure sensor switch, hydro mechanical unit (HMU), 3. pressurizing and over speed unit (POU). |
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How does fuel flow through the fuel system?
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Path Finders have little Penis
1. Low pressure suction engine driven boost Pump 2. Fuel filter 3. HMU 4. Liquid to liquid cooler 5. POU/ODV valve, out to either the primer nozzles (for starting) or the main fuel nozzles for engine operation. |
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Fuel Filter - PSI
Bypass Indicator Sensor Switch Impending Bypass Indicator Button |
Bypass Indicator Sensor Switch - 18-22 PSID
Impending Bypass Indicator Button 8-10 PSID |
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Engine Driven Fuel Boost Pump provides __ psi?
Fuel Pressure Sensor light comes on at? |
45-90 PSI
9 PSI |
