Page 33
Sub-section - 4.05
ABNORMAL PROCEDURES
FAA Approved
Original Issue: Feb 28, 2006
Hawker 850XP Pro Line 21 Airplane Flight Manual
HYDRAULICS
MAIN HYDRAULIC FAILURE
If Hydraulic Supply Pressure Reduces to Approximately 2300 PSI or Below
Refer to the Lowering of LANDING GEAR and FLAPS procedure below:
NOTE: 35,000 ft is the maximum altitude from which an emergency descent can be
accomplished within the 4 minute criteria as specified in 14 CFR Part 135,
without the use of airbrakes.
Altitude .......................................................................35,000 ft or below
Use of the Auxiliary Hydraulic System will be necessary to lower the LANDING GEAR and
FLAPS.
If EMRG BRK LO PRESS Annunciator is Illuminated -
Refer to EMERGENCY BRAKE LOW PRESSURE procedure - this Sub-section.
NOTE: Thrust reversers should be available for one deploy and one stow operation.
Lowering of LANDING GEAR and FLAPS
AUX HYD SYSTEM PULL handle .............................Pull - Do not reset
Hand pump ................................................................Operate until gear locks down
CAUTION: WHEN OPERATING THE AUXILIARY HYDRAULIC SYSTEM TO LOWER THE
LANDING GEAR, THE HAND PUMP ACTION MUST BE CONTINUED, AFTER 3
GREENS ARE ACHIEVED, UNTIL POSITIVE RESISTANCE IS FELT TO MAKE
SURE THE LANDING GEAR IS DOWN AND LOCKED.
LANDING GEAR lever ...............................................Select down
FLAP selector ...........................................................When required - set to desired
position.
Hand pump ................................................................Operate until desired position is
achieved.
NOTES:
1. The Air Brake, Lift Dump and Nosewheel Steering will all be inoperative.
2. If normal brakes with anti-skid are available, landing distance will increase by
approximately 24% above the landing distance with FLAPS 45
°.
LO PRESS
HYD 1
LO PRESS
HYD 2
and
Continued Next Page
For Training Purposes Only