HH-60G: Fuel

The advisory light (cat eye) near each BOOST PUMP control switch on the panel indicates:

Pump *Pressure* and operation These lights are connected to a Fuel Pump Pressure Switch at the top of each main fuel tank, which operates at 16 psi, the light indicates that the pump is running and there is adequate pressure at the respective pump outlet

When retracting the probe, fuel is returned to the _________

Right main tank

Why do we turn the Boost Pump OFF in #1 OR #2 FUEL PRESS CAUTION LIGHT ON?

So that the associated Boost Pump doesn't spray fuel out of the leaking line.

T/F: The (aerial) refueling system refuels the main tanks and aux tank(s) simultaneously (pg 1-18, Dash-1)

TRUE

FUEL LOW will flash when:

The #1 FUEL LOW and the #2 FUEL LOW warning lights on the caution/advisory panel will flash when the fuel level in each cell reaches approximately 172 pounds of fuel. At the bottom of each fuel quantity probe there are thermistor beads that are used for the low fuel level warning system. The Low Fuel Warning system is supplied by the No. 1 DC Primary Bus

When should the automatic fuel transfer system be activated?

The AUTO XFER should be initiated at 887+/- 10lbs, so it should occur when the mains read appx. 1800 lbs; if you hit 1700 lbs with fuel remaining in the AUX Tanks, you are not properly AUTO XFERing. (this is per Reinche; not in our Dash-1)

WARNING ________ with the refueling probe extended could result in inadvertent main rotor blade contact with the refueling probe. Also, flying with the refueling probe extended causes excessive wear on the internal parts.

WARNING *Excessive helicopter maneuvering* with the refueling probe extended could result in inadvertent main rotor blade contact with the refueling probe. Also, flying with the refueling probe extended causes excessive wear on the internal parts.

The Main Fuel tanks hold approximately ____ lbs of fuel together

2400 lbs The fuel quantity indicator scales are amber for 0 to 200 pounds of fuel, and green for 200 to 1500 pounds of fuel.

Output pressure of SUBMERGED BOOST PUMPS

25-27 psi (MX handouts say 25 psi)

The PRIME BOOST PUMP ON advisory light indicates that:

28 V DC is applied to the pump motor, it does not indicate pressure.

The fuel transfer pump will fail in _____(time) if it is left ON and the AUX tanks run dry

30 seconds

Output pressure of the ENGINE DRIVEN FUEL PUMP (technically a suction pump)

45-90 psi

Output pressure of the PRIME BOOST PUMP

5 psi

The LRB that indicates an impending fuel filter bypass pops at ______ psi

6 psid -1: "A red button on the filter housing pops out when filter element differential pressure reaches 6 psi to indicate an impending bypass."

Fuel Dump Rate

800 lbs per minute

Output pressure of HMU FUEL VANE

832 psi

#1 or #2 FUEL PRESS illuminates at: (PX & Location)

<9 psi "between the Engine Driven Low Pressure Fuel Pump and the HMU High Pressure Fuel Pump" (-1) Immediately after the engine driven fuel boost pump

If you have to take an engine to crossfeed (#1 OR 2 FUEL PRESS CAUTION LIGHT ON) what is your USABLE fuel supply?

EFQI-1200lbs

Do the SUBMERGED BOOST PUMPS operate on AC or DC power?

Each boost pump operates on 3 phase, AC, 115 volts No. 1 Pump: No. 1 AC PRI BUS No. 2 Pump: No. 2 AC PRI BUS

If any EFQI System ERR Codes display, the EFQI fuel quantity data should be considered unreliable. Aircraft may be flown if ______ and _________ if use is anticipated.

If any EFQI System ERR Codes display, the EFQI fuel quantity data should be considered unreliable. Aircraft may be flown if *MVID fuel quantity indicator is functioning correctly* and *auxiliary tank quantity is visually Checked* if use is anticipated.

If the 200 Gallon Internal Auxiliary Fuel Tank contains more than ______ of its total fuel capacity, the lower cargo rings structure securing the left and right restraint beams may fail on impact with the ground, causing the tank to dislodge. This causes an increase in probability and severity of injury.

If the 200 Gallon Internal Auxiliary Fuel Tank contains more than *58%* of its total fuel capacity, the lower cargo rings structure securing the left and right restraint beams may fail on impact with the ground, causing the tank to dislodge. This causes an increase in probability and severity of injury.

Fuel Quantity and Indicators: The MODE SEL switch on the fuel management panel should not be in _____ and ____ during the Fuel Indicator Test. In the AUTO mode, the selected pump will attempt to transfer fuel. If the main tanks are full, fuel may vent overboard and the transfer pump could overheat.

The MODE SEL switch on the fuel management panel should not be in *XFER* and *AUTO* during the Fuel Indicator Test. In the AUTO mode, the selected pump will attempt to transfer fuel. If the main tanks are full, fuel may vent overboard and the transfer pump could overheat.

Aux tank G ratings: - Forward - Aft - Vertical

20Gs Forward 18Gs Lateral 10Gs Vertical

Actions if NO FUEL XFER illuminates:

*NO FUEL XFER (AUX FUEL) CAUTION LIGHT ON* Check if there is remaining fuel in the AUX tanks: - No Gas = No Action - If fuel remains a transfer malfunction exists, refer to checklist.

Where does fuel go after the Fuel Selector Valve?

- Engine Driven Fuel Pump - Fuel Filter - HMU - Fuel Oil Cooler - ODV - Fuel Nozzles

Air refueling on-load rate:

1000 lbs per minute

Usable fuel in the 185 Gallon Tanks

170 Gallons

Fuel dumping will automatically stop at _____ lbs in each tank (hopefully)

172 lbs in each tank

What are your first 2 actions for #1 OR #2 FUEL PRESS CAUTION LIGHT ON.

1. Single-Engine Conditions: ACE-A 2. Fuel Selector (affected engine) - (XFD or DIR(if operating in crossfeed)

Amount of unusable fuel in the probe

1/2 Gallon

Fuel Quantity and Indicators: FUEL INDICATOR TEST Switch - PRESS and hold. (lower console) MVID FUEL QUANTITY (main tanks) segments and digits will indicate ___. ______ and _____ caution lights will flash, and _______ (or AUX FUEL) and ________ lights will illuminate

FUEL INDICATOR TEST Switch - PRESS and hold. (lower console) MVID FUEL QUANTITY (main tanks) segments and digits will indicate *0*. *#1 FUEL LOW and #2 FUEL LOW* caution lights will flash, and *NO FUEL XFER* (or AUX FUEL) and *MASTER caution* lights will illuminate The fuel low level indicator test circuit sends a signal through the low level warning conditioner (on the No. 1 DC Primary Bus; fed by the Low Level Sensors in each tank), to the #1 and #2 FUEL LOW caution lights and the MASTER CAUTION light. The fuel quantity system can be checked by pressing the FUEL IND TEST push-button on the miscellaneous switch panel, which will cause both vertical scales of the FUEL QTY indicator and digital readouts to change, and the #1 and #2 FUEL LOW caution lights to flash.

FUEL SYSTEM

FUEL SYSTEM

Describe the steps of: AUXILIARY FUEL SYSTEM - CHECKED

From Left to Right: - *XFER* - *MANUAL* - PUMP Switch - *NO 1* Check MVID *INCREASING* - PUMP Switch - *NO 2* Check MVID *INCREASING* From Right to Left: - *NO FLOW* - PUMP Switch - *NO 2* - *AUTO* - *XFER* (3 UP; 2 DN BUT do it RIGHT TO LEFT)

NO FUEL XFER illuminates at:

Fuel level in one or both main tanks is below appx. 550 +/- 55 lbs

The lighting of #1 FUEL PRESS or #2FUEL PRESS at ________ power settings and above could indicate an air leak or failed engine driven suction pump.

IDLE

Refueling Probe: Monitor main fuel quantity during probe extension and retraction to ensure no more than the normal _______ pound changes occur in total main fuel quantity. A decrease of _______ pounds in main fuel quantity may indicate a faulty number 2 fuel valve. A faulty number two fuel valve can cause fuel to transfer from main tanks to auxiliary tanks during probe extension/retraction and fuel transfers.

Monitor main fuel quantity during probe extension and retraction to ensure no more than the normal *20 to 30* pound changes occur in total main fuel quantity. A decrease of *80 to 120* pounds in main fuel quantity may indicate a faulty number 2 fuel valve. A faulty number two fuel valve can cause fuel to transfer from main tanks to auxiliary tanks during probe extension/retraction and fuel transfers. ("20-30" x 4 = "80-120") There is a gap between these two ranges to account for any previous maintenance action (i.e. maybe they drained the probe requiring it to be refilled, bringing it a little over 30 lbs)

The Prime Boost Pump and outlet valve can be manually activated by ___________ and automatically activated by _________, either primes each engine fuel lines and the APU. Fuel to the valve comes from the No. 1 Fuel cell.

The Prime Boost Pump and outlet valve can be manually activated by the FUEL PUMP Switch and automatically activated by the engine start system, either primes each engine fuel lines and the APU.

#1 or #2 FUEL FLTR BYPASS illuminates when:

The fuel filter is bypassed due to clogging

Why are the engines suction fed, as opposed to pressure fed?

To mitigate the possibility of a leak prior to the engine-driven low pressure fuel pumps (45-90psi)

WARNING The OVERFLOW indicator should be monitored during refueling or fuel transfers to detect an overflow. An overflow in conjunction with main fuel tank full indications are a symptom of a _______ failure in the fuel system. Refueling should be terminated immediately to preclude further fuel being dumped overboard.

WARNING The OVERFLOW indicator should be monitored during refueling or fuel transfers to detect an overflow. An overflow in conjunction with main fuel tank full indications are a symptom of a *high level shut-off valve* failure in the fuel system. Refueling should be terminated immediately to preclude further fuel being dumped overboard.

Why do we take the fuel selector of the affected engine to crossfeed for #1 OR #2 FUEL PRESS CAUTION LIGHT ON?

We take it to crossfeed in case there is a leak between the tank and the associated fuel selector.

When extending the probe, the transfer pump sucks fuel from _____

both main tanks

The fuel selector valves are ____________ connected to the fuel selector levers on the engine control quadrant by push/pull cables. The fuel detent felt in the fuel selector lever is physically located in the Fuel Selector Control Box and is connected by push pull cables.

mechanically