Hydraulic System

Question 1

Hydraulic Power Supply System Failure

Answer 1

Indications - a condition that cannot be corrected with manual hydraulic refill system

1. First and second stage hydraulic systems fluid quantity low - land as soon as possible
2. First and utility 1 hydraulic systems fluid low - land as soon as possible
3. All other combinations are land as soon as practical

Question 2

Utility 1 Hydraulic System Failure

Answer 2

Primary visual indications - (1) UTIL 1 HYD PRESS gauge on panel is redlined (2) UTILITY 1 PRESS caution light <1,500psi (3) UTILITY 1 OIL HOT above 107C or blower inop (4) UTILITY QTY T/R caution light

 *WARNING - extended flight with U1 Failure is not recommended due to possible loss of tail rotor control

1. Landing gear - extend
   
   • CAUTION - if it fails with ramp at or below ground level ramp contact can occur upon landing
2. Land as soon as possible

Question 3

Flight Control Hydraulic System Failure

Answer 3

Primary visual indications - (1) 1ST and 2ND STAGE HYD PRESS gauges are redlined (2) 1ST STG PRESS MR TR and 2ND PRESS MR caution lights (3) 1 STG QTY MR TR and 2 STG QTY MR caution lights (4) 2 STG OIL HOT caution light

1. Check that both collective flight control servo switches are ON
2. Air speed - 80KIAS
3. Land as soon as possible
   • WARNING - failure of both first and second stages will result in loss of control of helo
   • WARNING - rapid or abrupt movement of flight control with only one primary flight control system can result in control restrictions due to reduction in operating system

Question 4

Primary Tandem Servo Malfunction

Answer 4

Primary visual indications - 1 STG MR SERVO BYPAS and 2 STG MR SERVO BYPAS

1. Airspeed - reduce
2. Land as soon as possible

Question 5

Tail Rotor Tandem Servo Malfunction

Answer 5

Primary visual indication - 1 STG TR SERVO BYPAS and 2 STG TR SERVO BYPAS

1. Airspeed - reduce
2. Land as soon as possible

Question 6

Restriction or Binding of the Flight Controls

Answer 6

1. Check for any cockpit instructions to the flight controls
2. Reduce airspeed to 80-100KIAS
3. Minimize maneuvering
4. Avoid abrupt flight control inputs
5. Land as soon as possible