Emergency Electric Power

Question 1

How is the Emergency Gen powered?

Answer 1

The Green HYD system via 2 methods:
Big Green:
- One or both engine driven HYD pumps power the Green system. (8KVA EMER GEN output)

Little Green:
- The RAT only powers the Green system. Depending on airspeed HYD flow is 15-45% of engine driven pump. (3.5KVA EMER GEN output)

Question 2

What causes automatic activation of EMER ELEC CONFIG:
Big Green:
Little Green:

Answer 2

Big Green:
-Loss of AC bus 1 and 2.
-Both Engine driven Gens trip offline.

Little Green:
-Loss of both engines
-Lose all engine Generators

Question 3

When the Big Green HYD powers the Emergency Gen:
What Busses remain powered?
What displays remain?

Answer 3

4 Busses remain powered:
- AC Essential
- AC Essential Shed
- DC Essential
- DC Essential Shed
3 Displays remain:
- Captains PFD, ND, E/WD

Question 4

When the Little Green powers Emergency Gen:
What busses remain powered?
What displays remain?

Answer 4

Little Green powered by RAT
2 Busses remain powered:
- AC Essential
- DC Essential.
Displays remaining:
- Captains PFD
- E/WD

Question 5

If the Emergency Gen is powered by the RAT what are some considerations on the approach to landing:

Answer 5

• RAT Will disconnect when the Slats are extended.
• Can be reactivated w/ MAN ON PB after Slats are retracted.
• Airspeeds less than 140 kts RAT stops being effective.
• Batteries are only power from then on.

Question 6

Land Recovery:
What happens when the aircraft enters EMER ELEC CONFIG:

Answer 6

• Land Recovery AC and DC busses are shed.
  These buses contain systems required for landing but not Cruise.
• Will remain shed even if normal Power is restored.

Question 7

What does pushing the Land Recovery PB do?

Answer 7

It recovers the land recovery AC and DC buses.
This restores systems required for landing.

Question 8

Pushing the Land Recovery PB and the Emergency generator is powered by the Big Green:
What systems are recovered?

Answer 8

Big Green:
- LGCIU 1 (Landing Gear & Control Interface Unit)
- SFCC 1 (Slat/Flat Control Computer)
- BSCU CH 1 (Brake Steering Control Unit)
- LH Windshield heat
- LH Landing Light

Question 9

Pushing the Land Recovery PB and the Emergency generator is powered by the Little Green:
What systems are recovered?

Answer 9

Little Green:
- LGCIU 1 1 (Landing Gear & Control Interface Unit)
- SFCC 1 - Slat Channel only