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WELCOME. THREAT AND ERROR MANAGEMENT HYDRAULIC FAILURES AS350B2 AIM -To recognise symptoms of Hydraulic Failure - respond with emergency actions - land.

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Presentation on theme: "WELCOME. THREAT AND ERROR MANAGEMENT HYDRAULIC FAILURES AS350B2 AIM -To recognise symptoms of Hydraulic Failure - respond with emergency actions - land."— Presentation transcript:

1 WELCOME

2 THREAT AND ERROR MANAGEMENT

3 HYDRAULIC FAILURES AS350B2 AIM -To recognise symptoms of Hydraulic Failure - respond with emergency actions - land safety. RECOGNITION - System Pressure below 30 bars (440 PSI) pilot indications Controls remain powered (Accumulators).

4 HYDRAULIC FAILURES AS350B2 OBSERVATIONS - Average time required to attain safety speed range (40-60 knots)…Less than 30 seconds from VNE or hover. Hydraulic accumulators charged fully. Hydraulics available through manoeuvres to reach safety speed range. Pre Take Off Checks - Light out 4 seconds. (Ref: RFM Section 8, page 19) Confirm hydraulics failed - HYD light on - pedals firm (Load compensating servo) EMERGENCY ACTIONS - Airspeed - Accumulators - Isolation Hydraulics - Run On Landing.

5 HYDRAULIC FAILURES AS350B2 AIR EXERCISE - (1) Recognise Hydraulic Failure HYD light on - HORN - Sounds - Pedals Firm - Controls Powered. (2) Airspeed 40 to 60 knots. (3) Select Hydraulic isolation Switch (Collective) OFF (4) Load Feedback 2-3 seconds. Heavier at higher airspeed. Cyclic = 7-12 kgs - left hand load. (Note: Do not push HYD accumulator test depressurise load compensator - T/R controls heavy/flat pitch). Cyclic = 4-5 kgs - FWD load. Collective = Neutral loads - Heavier. Lower Speed. Pedals = Little load at knots.

6 HYDRAULIC FAILURES AS350B2 RECOVERY - (1) Plan a shallow approach to clear flat area. (2) Land into wind with forward run-on landing. (10 knots) - FLAPBACK Do not hover - Refer NTP No Helicopter will yaw/drift left. Control forces change/direction intensity. As airspeed slows prior to touchdown control forces can increase. Cyclic = 15 kgs - Left Hand Load Cyclic = 17 kgs - Forward Collective = 20 kgs - Heavier Pedals =Firm - Balanced (3) Shutdown engine holding collective down on Low Pitch Stop. (4) In Hover Hydraulic failure. Land normally (Accumulator Pressure). (Shutdown engine holding collective down on Low Pitch Stop).

7 HYDRAULIC FAILURES AS350B2 AIRMANSHIP -Refer - (1) RFM Section 3, Supplement 7 and Eurocopter THM Section 8 for Review. (2) AS350B2 - Control forces heavy. Push forward hard to keep speed to touch down. (3) Hydraulics off training AS350B3 - Ensure throttle notch locked + friction.

8 HYDRAULIC FAILURES AS350B2 THREATS (1)General threats: - weather - traffic (disrupted App and Collision Avoidance) - command gradient (2)Exercise specific threats: - lack of systems knowledge - overshoot briefing and actions ERRORS - Confirmation (double check) of helicopter configuration HYD TEST RESET - Left drift on ground roll (lack of right cyclic offset) - Lack of positive control input - Cyclic FLAT DO NOT ATTEMPT TO HOVER RUN IT ON

9 HYDRAULIC FAILURES AS350B2 INCIDENT HISTORY (1) 17 July 2007 – AS350 Super D on approach HYD/Horn on due to HYD pump spling failure (2) 9 March 2011 – AS350B2 in cruise experienced HYD/Horn on due to coupling sleeve internal spling failure

10 THANK YOU


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