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B-1A Lancer > B-1A Secondary Power Systems > Flashcards

B-1A Secondary Power Systems Flashcards

0
Q

How many SPS units are in the B-1A?

A

Two.

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1
Q

Name the components that comprise the integrated propulsion system of the B-1A.

A

Propulsion engines, ETCS, AICS, SPS, engine & APU fire detection / extinguishing systems.

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2
Q

The SPS contains an:

A

Auxiliary power unit.

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3
Q

What do the APU’s & ADG’s do?

A
  • Provide power for starting engines & driving ADG’s to power IDG’s & hydraulic pumps.
  • ADG’s act as power path for engines to provide torque to power IDG’s & hydraulic pumps when coupled up.
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4
Q

The APU start motor is:

A

Hydraulic.

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5
Q

Are the APU’s constant-speed?

A

Yes.

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6
Q

The two SPS APU’s provide shaft power to do what two functions?

A
  • Motor & start propulsion engines.

* Supply torque to drive respective ADG’s.

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7
Q

The APU gearbox is mechanically connected to which part of the APU turbo machinery?

A

The APU compressor.

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8
Q

During normal APU operation, the APU gearbox transmits shaft power to:

A
  • APU accessories

* The ADG(s) it’s coupled up to.

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9
Q

APU oil is contained where?

A

In the APU gearbox sump.

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10
Q

APU gearbox sump capacity is rated at:

A

4.0 quarts (2.5 quarts usable).

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11
Q

At max oil consumption rate, 4.0 quarts of oil will last:

A

50+ hours.

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12
Q

The APU fuel system is composed of:

A
  • Fuel control assembly
  • Fuel SOV
  • Fuel flow divider valve
  • Primary & secondary fuel manifolds / nozzles
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13
Q

What purpose does the ECA serve in the secondary power system?

A

The ECA controls the APU’s & associated auxiliary drive systems.

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14
Q

What does ECA mean?

A

Electronic control assembly.

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15
Q

Exactly how does the ECA work with the SPS?

A

The ECA contains the logic circuits to control both the APU’s & ADS’s in response to internal signals and flight crew control inputs from SPS / ADS controls.

16
Q

Does the ECA monitor SPS operation?

A

Yes, both APU’s and ADG’s.

17
Q

Is the ECA a MIMO, SIMO, SISO, or MISO system?

A

MIMO.

18
Q

Output signals from the ECA go to:

A
  • APU T5 indicators
  • APU RUN lights
  • HYD pump depress. valves
  • Master caution & ADS lights
19
Q

The APU ALERT START & STOP buttons are electrically connected to the:

A

APU fire, start, hold delay, & hydraulic pump ground lockout relays.

20
Q

The left APU start module is powered by the:

A

No. 2 hydraulic system.

21
Q

The right APU start module is powered by the:

A

No. 3 hydraulic system.

22
Q

The APU START, FIRE, hold delay, RUN, and HYD pump ground lockout relays have electrical inputs from:

A
  • Fire detection system
  • L/G load sensors
  • Engine start switches
23
Q

The APU relay outputs also go to which fuel supply system components?

A
  • Tank isolation valves

* APU firewall fuel SV’s

24
Q

How many power paths are there between the engines and APU’s?

A

Three paths.

25
Q

Name the three power paths of the APU-engine-ADG system.

A
  • Engine-ADG path
  • APU-ADG path
  • APU-engine path
26
Q

Explain the engine-ADG path:

A
  • Normal mode of driving accessories

* Torque is transmitted through a PTO-ADG shaft.

27
Q

Explain the APU-ADG path:

A
  • Used to drive ADG accessories when engines are not operating
  • Controlled via ADS couple knobs
28
Q

Explain the APU-engine path:

A
  • Used for engine motoring or starting

* Torque is transmitted via a torque converter in ADG and through the PTO-ADG shaft to engine.

29
Q

When setting ADS couple knob to any position other than DISEN, what occurs?

A

The ADG acceleration control device is energized, allowing the APU PTS to drive accessories (HYD pump & IDG).

30
Q

Once the ADG is coupled, the accessories reach operating speed within how much time?

A

4 seconds.

31
Q

The torque converter is drained automatically at what N2 speed?

A

57%-59% N2.

B-1A Lancer (7 decks)

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