Walkaround

Question 1

What’s the minimum battery voltage?

Answer 1

SOPM4-2.7

• 1 or both battery levels must be 22.5V
• If 21V and greater, then you can recharge the battery through an established AC source.
• If less than 21V, then call MX

Question 2

How do we know if GPU power is available and usable?

Answer 2

• Available:
  White AVAIL light illuminated.
• Usable:
  Electrical synoptic page - green line indicates flow

Question 3

What do you do if established on Ground power and AC power from unit drops off?

Answer 3

SOPM 5-2.9

When AC power lost:
- power down: the aircraft using the “leaving the aircraft checklist”, then perform the power up using the “safety and power up checklist”

Question 4

Why is it important to charge the batteries prior to departure?

Answer 4

To ensure maximum battery life in the event of abnormal operations.

Question 5

What is the hydraulic fluid color?

Answer 5

Red/purple

Question 6

Which hydraulic system do we normally taxi with?

Answer 6

Normally:
Hyd system 2 - bc, left, #1 engine normally started for SE taxi. After engine start: flaps >0, and brake released activates hyd 2. Plus Nose steering on Hyd 2.

If taxi non-standard - right, #2 engine only
-Hyd system 1 must be manually selected ON, bc the hyd 1 engine driven pump not running and elec hyd pump doesn’t turn on till
GS >50kts, flaps > 0.
-This will give us outboard brakes.

Question 7

What is the PTU? What is its function?

Answer 7

AOM 14-11-110

Power Transfer Unit:

• Utilizes the the motor from hydraulic system 1 for Hydraulic system 2 pump.
• There is no fluid transfer.
• Assists in gear extension/retraction (specifically on go-around) during a loss of engine driven hydraulic pump 2, or Right, #2 engine failure.
• PTU will not work on the ground
• Operates automatically when:
  1. Flaps greater than 0 or landing gear not UP
  2. Engine driven pump 1 NOT FAIL (motor)
  3. Hyd 2 Reservoir greater than 12%