MH60T Trivia #576-600

This trivia series distills over 20 years of flight manual study into 500+ focused questions and answers, posted in 25 question sets. It’s not a substitute for the manual, but rather an aid to facilitate study and strengthen airmanship. During your review, ask yourself: How is this operationally relevant? Do I need to memorize it, or just be familiar with it? Should I review more on this topic? 

576. Q: What can happen to the electrical system and engine condition in a  severe lightning strike?  
     A: Loss of all power except the battery utility bus.  

577. Q: The secondary bus powers what items?    
     A: The tail rotor de-ice and the copilot windshield anti-ice.    

578. Q: When will main rotor de-ice and tail rotor de-ice fail lights not be on even though the systems are not working?   
     A: When running on APU power only, these cautions do not illuminate, with any  main generator they will work. Note: A potential scenario where this would be relevant is during a transmission malfunction in icing conditions. To manage the malfunction, the crew would start the APU and secure both main generators. In this situation, the MR blade de-ice, TR blade de-ice, and copilot windshield anti-ice would   be inoperable with no cockpit indication.   

579. Q: External AC power powers which buses?    
     A: All of them.   

580. Q: With de-ice master in auto, what happens when ice is detected?    
     A: Ice detected caution light illuminates, ice detector heater is turned on to remove the ice and reset for another cycle, windshield anti-ice is turned on, engine anti-ice is turned on, blade de-ice is turned on (regardless of switch positions). Note: This can lead to a surprise activation of the engine anti-ice and a subsequent loss of up to 18% power available.    

581. Q: What 2 things are sensed to determine element on time (EOT) in the Auto  mode?    
     A: OAT and ice rate signal.    

582. Q: Manual de-ice should be used when?    
     A: When there is an ice detect fail caution, or the pilot judges that ice rate  system is inaccurate (e.g., torque increases unacceptably, vibration increases unacceptably). Note: Why don’t you just use manual-high to make sure that the ice is melted? The auto de-ice system is designed to cycle heat at the appropriate time and duration to build ice on the leading edge of the blades then shed it. Using manual-high may lead to moisture moving aft on the blade and freezing on a portion of the blade where the de-ice cannot remove it (a.k.a. “runback ice”).    

583. Q: Outside air temp (OAT) limits for performing the EOT test?    
     A: Do not perform test with temps over 38° C; 22-38°C – after 5 minutes with 100% Nr; 10-22°C – with 100% Nr; less than 10°C – blades need not be turning.    

584. Q: How long can the POWER MAIN or POWER TAIL  lights illuminate during operation or test of a system?   
     A: If greater than 10 seconds, system must be turned off.    

585. Q: What do the POWER MAIN and POWER TAIL lights signify?   
     A: During normal ops, when power is still applied after a failed condition or when power switch is turned off. During the test, the lights indicate normal operation of Power Light System.    

586. Q: How many main rotor blades are heated at one time during de-ice operation?    
     A: Two blades, one element on each blade.    

587. Q: How many elements are there per blade?    
     A: Four.    

588. Q: How many power cycles does it take to go through each of the elements on each of the blades?   
     A: Eight.    

589. Q: Best rate of climb airspeed?   
     A: 65-75 KIAS.  Heavier = faster  

590. Q: Max endurance?      
     A: The lowest torque in which you can remain level, usually about 45% Q, 65-75 KIAS (sea level). Note – Fuel consumption decreases with an increase in altitude but not more than 75 lbs./hr.  

591. Q: Max range airspeed around 20,000 lbs at 6000’ MSL and sea level?    
     A: 6000′ PA – 110 KIAS, 74%; Max range sea level – 128 KIAS, 78%. Note: The lighter the helicopter is, the higher the max range altitude.    

592. Q: Max Range airspeed around 20,000 lbs at 8000 and 2000’ MSL?   
     A: 8000’, 100 knots indicated airspeed, 2000’, 124 knots indicated airspeed. Note: Max range airspeed coincides roughly to a torque application in the mid-seventies from sea level to 8000′ MSL. Initiate max range airspeed at 75% and then fine tuning from there based on performance data and winds (max specific speed). 

593. Q: Safety precautions for simulated instrument flight (use of view limiting devices)?   
     A: All stations must have operable ICS. Safety pilot will be responsible for the lookout. Cannot be used below 500’ AWL/AGL at night.

594. Q: When does the 30-minute TGT accumulated time reset on the status page?  
     A: The 30-minute TGT accumulated time will count up from 0.0 minutes to 99.9  minutes. When the time accumulation reaches 30 minutes, the check exceedance annunciation will be displayed . The 30-minute timer will reset to zero when the  aircraft is on deck with engine operating below 90% Ng for 5 minutes.  

595. Q: Criteria that will result in TEMP MAINT?  
     A: TGT 30-minute accumulated timer exceeded.  
     TGT 30-minute timer exceeded.  
     TGT 10-minute timer exceeded.  
     TGT 2-1/2-minute timer exceeded.  
     TGT 12-second timer exceeded.  
     TGT >949 °C.  

596. Q: Criteria that will result in an OVERTQ LOG?  
     A: 254% <(Q1 + Q2) or 144% <Qx or 212.25% ≤(Q1 + Q2) ≤254% for >10 seconds  or 135.25% ≤Qx ≤144% for >10 seconds.  

597. Q: Criteria that will result in OVERTQ INSPECT?  
     A: 242.00% ≤(Q1 + Q2) ≤300% >10 seconds or 144.25% ≤Qx <150% for >10 seconds.  

598. Q: Criteria that will result in OVERTQ MAINT?  
     A: 300% ≤(Q1 + Q2) or 150.25% ≤Qx.  

599. Q: At what altitude will RADALT hold not be available?  
     A: Above 1500’ AGL.  

600. Q: What will occur if RADALT hold is engaged and the aircraft senses an altitude above 1500’ AGL?  
     A: AFCS Degraded Caution will appear and RADALT hold will switch to BARALT hold.