KC-135 Gouge



APPENDIX: Systems GK

Electrical System

1. Describe the 3 Battery Feeder Fail Scenarios

a. BATTERY FDR FAIL: Battery feeder protection unit has failed or the c/b is popped.

b. BATTERY FDR FAIL + EMER BUS FDR FAIL + BATT CUTOFF: Battery fault caused it to be disconnected from emergency bus and DC power system

c. BATTERY FDR FAIL + EMER BUS FDR FAIL: Emergency bus feed line failed (c/b may be popped.) Battery connected to system but battery feeder protection unit lost power and Emergency bus is powered now from LH load bus only.

2. What type and number of batteries we have in T-1?

3 batteries: 24V/40 AMP lead acid as Main Battery, 24 V AHRS, 24 V Standby battery (also have a battery for each clock, batteries for each emergency light, ELT battery)

3. How long does the stby battery last for?

30 minutes (According to the maintenance –2 the stby battery and the main battery in emer will provide a total of 30 minutes of power.)

4. What is main difference between having Stby power and Emergency power?

Pitch trim and gear position indications. Also, on stby you don’t have intercom, annunciators, flt deck lighting.

5. What components are powered by the standby bus?

Co-pilot instrument lights, engine EFC start, left ITT, RTU 1, stby instruments, UHF radio

CRUISSE (Copilot instrument lights, RTU 1,UHF 1 radio, ITT #1,Standby Altimeter Vibrator, Standby Attitude indicator, EFC (start))

6. What components are powered by the emergency bus?

The major ones are: gear position indicators, emergency pitch trim, fire bell, left N1 and N2, nav 1, engine fire extinguishing capability. SLEEVES (Selected left hand instruments, Landing Gear position, Engine ignition and Control (left engine only), Emergency Pitch Trim, VHF Nav 1,Engine Fire detection (fire bell only – not the warning lights), Standby Bus)

7. What are the functions of the GCU?

Ground fault protection, over voltage protection; reverse current protection and equalization circuit load

8. What is the maximum generator load for one generator up to 32,500 ft, 32500-41000?

400 Amps; 32,500-41-000 280 amps both operating 280 Amps per generator

9. Can the standby battery power the emergency bus?

No- a diode prevents this from happening but still allows the normal aircraft battery to feed the stand by bus through the emergency bus.

10. What do you lose when you lose all AC power?

26V primary – pitch trim position; 115V primary- GPWS; 26V Primary shed-flap position, LH, RH oil pressure, 115V primary shed is not used; 26V secondary-not used, 115V secondary-GRE

11. Can you reset the bus feeder circuit breakers?

No.

12. How many bus feeder lines there are and how many are used at a time?

3/2

13. What causes the AC bus shed light to come on?

Emergency bus powering #2 inverter and #1 inverter failed.

14. What do you lose when you lose a generator?

Nothing if the other generator is working.

15. Initially, what do you lose when you lose both generators?

Transfer fuel pumps, aux cool.

16. What is the power source for non-GPU engine starts on the ground?

First engine – battery; second engine - generator.

17. What is the power source for starter assisted air starts?

Battery.

Engines

1. When do the ignition switches actuate from the standby position?

Engine anti-ice is selected, stick shaker or engine start

2. What happens when you press the engine fire switch?

Fuel valve closes, hydraulic valve closes, generator is switched off-line and the fire bottles are armed

3. What components are driven by the accessory gearbox? (SHOPPN)

DC Starter-generator, HMU, Oil pump, hydraulic Pump, engine driven fuel Pump, and N2 speed sensors,

4. Which engine is the Master for engine synchronization?

The left engine. The limit for slaving is 1.5% N1 or N2

5. What lights come on when you shut down an engine?

GEN OFF, OIL PRESS LO, ENG EFC OFF, FUEL PRESS LO

Environmental

1. What is bleed air used for?

Hydraulic reservoir pressurization, anti-ice, door seal, pressurization, bearing compartment oil seals, HMU operation, and cooling air for the turbine disks and high-pressure stator vanes. H.A.D.P.B.

2. What is the max cabin altitude?

12,500 +- 1500

3. When does the cabin pressure low annunciator illuminate?

When cabin altitude exceeds 9,500 +- 500’

4. What are the cabin rate of change knob limits?

50 to 2000 ft/min

5. When does the cabin pressure hi annunciator illuminate?

When the cabin pressure differential exceeds 9.1 +- .1 psi

6. Why do we use Emergency Pressurization?

In case Normal pressurization (ACU) fails

7. Describe AI /Deice tests-

See section II (Before TCTO 1T-1A-641 and After)

8. When does the wing anti-ice operation light illuminate?

When the temperature reaches 140F

9. When does the WING OVHT annunciator illuminate?

When the 350F or one of the two 212F temperature switches close

10. How does the stab anti-ice/de-ice system work?

Electrical power is supplied to the 12 heater elements of the leading edge and elevator horns to maintain the temperature between 260F and 280F. When the temperature reaches 280F, power is interrupted momentarily and the system will continue to cycle

11. When does the STAB ANTI ICE FAIL annunciator illuminate?

When the temperature reaches 310F

12. How does the manual backup system work?

The switch should be pressed momentarily to provide a 30 second cycle of heating to only the gap heaters in the elevator horns and the outboard ends of the stabilizer.

13. How does the engine Anti-Ice system work?

Bleed air is routed through a piccolo tube and mixed with ambient air to heat the nacelle leading edge.

14. What parts of the engine are continually anti-iced?

High compressor turbine air is continuously directed to the inlet cone, T1 temperature probe and low compressor inner stators

15. When does the ENG ICE TEMP LO annunciator illuminate?

When the engine anti-ice switch is on and the temperature is below 120F

16. How does the wing anti-ice work?

Bleed air from the engines is regulated to 34-44 psi and mixed with ambient air for distribution to an air duct formed by the double walls of the leading edge of the wing. The air creates a venturi which draws ambient air from the ram air scoop, which mixes with the forced bleed air producing a warm mixture in the piccolo tubes. The tubes warm the leading edge air duct and the air is vented at each wingtip. Both throttles must be maintained above 70%N2 to provide electrical power to the bleed air valve.

Hydraulics

1. What constitutes the hydraulic package?

Flaps, landing gear, anti-skid, power brakes and speed brakes F.L.A.P.S.

2. Explain Anti-Skid, Power, manual and Emergency braking?

Power braking is the normal mode of operation when the aircraft hydraulic system is applying normal hydraulic pressure to the brake system. It has limited effectiveness. Anti-skid mode is electrically controlled system and provides locked wheel skid controlled and anti skid failure detection. Power braking and anti-skid are available if the aircraft hydraulic system is working. Manual Mode is used when hydraulic pressure is not available to the power control valve. Emergency braking is a backup that provides nitrogen pressure for braking in case the aircraft hydraulic system fails.

3. What is the Hyd pump output in gpm?

0-3.9 gpm

4. When do you get a Hyd pump press low annunciator?

750 psi

5. What is the Hyd reservoir capacity?

1.1gal

6. When do you have to add Hyd fluid to reservoir?

.8 gal

7. When do you get a Hyd Level Low light?

.6 gal

8. What hydraulic components are lost without electrical power?

Flaps, landing gear (normal extension), anti skid and speed brakes

9. Why is the hydraulic reservoir pressurized with bleed air?

The reservoir uses filtered regulated bleed air to maintain hydraulic pressure and prevent foaming of the liquid in the reservoir.

10. What are the functions of the bypass and relief valves?

The relief valve opens at approximately 1650 psi to relieve an over pressure condition by returning fluid through the return line to the reservoir.

11. How does the emergency braking system work?

When the emergency braking handle is depressed, a separate nitrogen line sends nitrogen to the brake assembly. As the valve is released, residual nitrogen pressure is vented overboard (use only one steady application). The nitrogen storage cylinder provides sufficient pressure for at least 7 to 10 applications. If pressure was used to close the doors then only 7-9 applications.

12. How does the alternate gear extension work?

Pulling the CB bypasses the gear sequencing. The EMER L/G Down handle releases the main door, main gear and nose gear uplocks. Once this occurs, the gear free fall to the down and locked position. The gear doors are then retracted via nitrogen pressure applied to the main gear door actuating cylinders.

Fuel

1. In what orders do fuel tanks fill up?

Refueling manifold check valve to aft fuselage to aft cabin, mid tanks, wing tanks.

2. At what times does the boost pumps come on automatically?

Engine start, cross feed, fuel feed chamber less than full, less than 5+-.5 psi in the fuel feed line. EFFC (Engine Start,Fuel feed line ................
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