Limits from the Flight Manual of the Australian MRH90. Correct as at 27 Aug 2014.
What are the prohibited OPS?
Aerobatics. Autos to touchdown. Analogue FCS mode in training. Penetration in cloud with 'Significant Vertical Development'. Also in Flight man - Flight in Freezing rain. Flight with Negative G Loading.
What are the T4 start limits?
750 - 840 deg 20 secs. 840 deg MAX. 841 - 920 deg for 4 secs during a re-light
What are the AEO T4 limits?
831 deg CONT. 863 deg 30 min. 904 deg 30secs
What are the T4 OEI limits?
866 deg CONT. 903 deg 2 mins. 977 deg 30 secs
What is the normal idle T4?
570 deg + (2 x OAT Degrees)
What are the Nf limits?
57-75% 20s TRANSIENT during START/SHUTDOWN. 75-105.5% NORMAL POWER ON. 105.5 - 117.0% 6s NORMAL TRANSIENT. UNUSUAL TRANSIENT 117% 20s
What are the TQ limits OEI TRG?
84% MCP. 106% 2 mins. 130% 30 secs
What are the TQ limits AEO?
<40KT is 100% MCP or 110 for 20 sec. >80KT is 91% MCP or 100% 20 sec.
What are the TQ limits OEI?
102% CONT. 130% 2 mins. 158% 30 secs
What is the note with the CYAN Vtoss line on the ASI?
Vtoss values less than 45KTS will display at 45 KTS
What is the Min and Max gross weight?
Min - 6900Kg. Max 10600Kg or 11000Kg with External Load.
Where is the Center of Gravity measured from?
6.7m forward of the main rotor head center
What is the Max internal load?
What is the max floor loading?
1500Kg per m2 or 10Kg per cm2
When is ECS heating in APU mode prohibited?
>20 deg or during APU start.
What limits are there if ECS inoperative and >30 Deg OAT?
Avoid intensive use of aircraft radios.
What must you do if ECS inoperative and >35 deg?
On ground - open cockpit doors. In air - open cockpit windows.
What must you closely monitor when >40 deg and doing ground runs or hover OPS?
You must closely monitor the HYD Temp on VMD.
When >45 deg what should you do before you have confirmed ECS operational?
Open all doors until ECS has been checked and works.
What must you avoid when >45 deg and the ECS is inoperative?
Avoid intensive use of the ICS.
What do the colours mean on the cabin anchor points?
Glued anchor points are RED 10kN. Screwed anchor points are GREEN 16kN.
What is the WARNING about EFS with an external load?
Avoid arming EFS over populated areas with external load. If EFS activiates load will be jettisioned.
What is the max ALT for arming and inflation of EFS?
What is the AoB limit in IMC with 1 fuel pump failed?
45 deg AoB. This is to stop fuel stavation if the second pump fails to the same engine.
With both FCDC available what are the min and max speeds in IMC?
50-80 KTS with airspeed hold set. Otherwise 80 - 160KTS.
IMC Speed range in ASAS - T or when one/both PFCDC unavalible?
IMC speed limit after double Air Data Computer (ADC) fail?
Recommended IMC approach speed after double Inertial Ref System (IRS) fail?
Vmin with single ADC fail?
60 KTS - You can go slower only in a rescue mission.
What is Vne when IMC?
When is use of Icing Protecion System prohibited?
When blades have been fitted with Sand Protection Kit.
What is considered icing conditions in MRH-90?
5 deg and visible moisture.
When is flight in ICING and SNOW permitted?
When IPS Servicable and selected ON/AUTO before visible moisture or ON/AUTO at night when icing signal detected.
What is the temp limit for testing the ROTOR and STAB de-ice?
No test when >20 deg.
When is the SEVERE icing function used?
When NORM or EMERG cannot prevent significant increase in vibes or TQ.
Can you fly in freezing rain or hail?
Flight in freezing rain or drizzle is prohibited. Aviod hail but if encountered fly at minimum speed to reduce damage.
What are the max ground speeds for nose wheel locked and unlocked?
Unlocked 20 KT GS. Locked 50 KT GS.
When you have used extensive brakes before takeoff what must you do?
Leave gear down for 5 mins to cool them.
What is the limit when using toe brakes and applying the Park Brake?
Toe brakes must be released slowly not less than 2 seconds. Otherwise the Wheel Brake Metering Unit will get damaged.
Max braking GS when 10600Kg and when >10600Kg?
10600Kg is 35 KT GS. >10600Kg is 30 KT GS.
How many PSI is 1 Bar?
1 Bar is 14.5 PSI.
What is the RADHAZ avoid area for ships?
2500 yards except for CHOULES and TOBRUK.
Max wind speed for rotor start and stop?
Normal start max 30 KT. Quick start 48.5 KT. Rotor stop max 48.5 KT.
What is the CAUTION regarding BRAKE use during RTR BRAKE fail?
Use of rotor brake recommended when >30 KT. You can still use brake in RTRBK FAIL but it must be visually inspected afterwards.
Max wind for folding?
When must the aircraft be tied down?
Tied down when >50KT and >7000KG.
What is Vne power on for different weight categories?
up to 10000KG is 175KT. >10000-10600 is 165KT. >10600 is 140KT.
How much does Vne reduce for height?
Take off 3 KTs per 1000ft PA.
What is Vne power off or OEI?
Vne minus 40KTS.
Vne cabin doors open?
Max speed gear fully extended (Vle) or during extend and retract (Vlo)?
Max speed to operate the wipers?
Max speed when ramp and hatch both open?
Max speed when just ramp open or just hatch open?
Max speed operating ramp or hatch or cargo doors?
Max speed Floats armed?
Vne for inflation of floats?
Vne with floats inflated?
Vne Float inflation or flight power off?
Max speed for extend and retract of fast rope arm?
Max speed when hoisting?
Max speed for extend or retract boom with a load on the hoist?
Max speed for booming in and out or just boom out with cable stowed?
What is the max speed for a 2000Kg load?
What is the max speed for external loads >2000 Kg?
What is the max AoB with hatch open?
30 deg AoB
What is the max AoB with ramp and hatch removed?
30 deg AoB
What is the max AoB with Cargo hook or Hoist OPS?
30 deg AoB
What are the manoeuvre limits when >10600 Kg?
Max 30 deg AoB. No Pull-ups. Quick-Stops or Steep Approaches
What is the max hover tail and crosswind?
Up to 4250 ft DA - Tail wind 35 KT and Crosswind 48 KT.
What are the max hover speeds with floats inflated?
30 KTs all directions.
Max wind speed for fast roping?
Aircraft limit or 45 KTs whichever is less.
What is the nose up limit when you are right wheel upslope?
Max 8 deg nose up to prevent the stab contacting the ground.
What is the max slope for AGW OPS with rear wind?
Max 3 deg all directions.
What are the slope limits with wind < 17KT?
10600Kg 7deg Nose Down. 12deg all others. When >10600Kg still 7deg Nose Down. 10 deg all others. NOTE - AGW with any tail wind and the limit for all is 3 deg!
What are the slope landing with wind 17KT or greater?
10600Kg 5deg Nose Down. 10deg all others. When >10600Kg still 5deg Nose Down. 8 deg all others. NOTE - AGW with any tail wind and the limit for all is 3 deg!
What are the nose up limits for landing and takeoff?
Ramp closed 12 deg NU. Ramp horizontal 10 deg NU.
Can you use the APU in flight?
APU cannot be started or operated in flight.
What are the limits on APU restart after intentional S-Down?
Wait 2 minutes and Cycle the APU control switch to OFF then back to ARM.
What are the limits on APU restart after a failed start?
30 sec wait for starter to cool. Max 3 attempts then 20 min cool or Max 2 attempts after a flight.
What are the MGB Oil Temp Limits?
Minus 10 to 116 deg
What are the MGB Oil Press Limits?
On Gnd at 100% Nr 2.4 Bar. Normal OPS 4.5 - 7.5 Bar
What is the MGB Input max Oil Temp and NOTE?
Max 150 deg. NOTE - Continous OPS are permitted between 150-155 deg. The INPUT T Caution illuminates at 155 deg.
What are the TGB IGB and RAGB Oil Temp Limits?
Minus 15 - 120 deg
What are the TGB IGB and RAGB Oil Press Limits?
On Gnd at 100% Nr 0.9 Bar. Normal OPS 1-8 Bar
What are the Engine Oil Temp Limits?
Minus 10 - 130 Deg. Max 119 Deg when using JET-B Fuel.
What are the Engine Oil Pressure Limits?
Min on GND at 100% Nr 2 Bar. Max Continous 8.4 Bar.
What are the Engine Oil pressure limits during start?
Oil temp <10 Deg allowed 8.4 - 15 bar for 4.5 Mins. Oil 10 - 40 Deg allowed 8.4 - 12 Bar for 1.5 Mins
What is the maximum dry crank on the ENG Starter?
What are the ENGINE start limits?
Max 3 Attempts. AFTER FIRST ABORT - 1.5 min rest - 20s crank - 30 sec cool. AFTER SECOND ABORT - 3 min rest - 20s crank - 30 sec cool. THIRD ABORT - 1 Hour rest.
What is the Max time running an ENG against the rotor brake in PARK?
1 Engine only permitted for Max 10 Mins.
When can you apply the rotor brake to PARK?
Both ENGINES stopped and both SIF in the STOP position.
When can you apply the rotor brake on Shutdown?
Normal 55% Nr and Emergency 100% Nr.
What are the power on Nr limits?
Min transient 20 secs 83%. Stable 95 - 100.7%.
What are the power off Nr limits?
Min transient 20 secs 83%. Stable 88-110%. Max transient 20 sec 115%.
When do the Nr audio warnings come on?
95.5% Nr and 110% Nr.
What are the Efficiency Meter Limits OEI?
Continous 100.5%. 105% 2mins. 114% 30 secs
What are the Efficiency Meter Limits AEO?
96% MCP. 100% 30 min. 101.5% Transient.
Max OAT for ENG relight in flight?
What is the max OAT for APU start at sea level?
Max residual T4 for engine start?
What is the maximum time on the ground on DC power? Why?
Max time on DC ground cart or battery is 10 mins. The MAB Fans are AC so this stops them getting too hot.
How many times can you reset an electrically powered system?
One reset only.
Max fuel in main tanks?
Max pressure refuel rate?
600L per min.
What is the max temp on HYD Fluid?
Normal maximum 120 deg. If above this for >3 mins maintenance action is required on Main RTR Actuators. Max limit 135 deg.
What are the HYD Pressure limits?
Min 162 Bar. Normal 180-225 Bar. Max 235 Bar.
When must P3 be manually selected off?
Prior to start and shutdown. P3 automatically switched off above any OEI continous setting.
When can you not use the backup pressure instruments?
Dont use when cockpit window open or only hatch open.
What is the minimum speed for PP (Present Position) update to be used?
What is the SATCOM safety distance on the Ground?
100m to any hangar or refuelling OPS. 2m to military pers. 4m to general public.
What is the WARNING with the Collective Safety Function Inhibited?
Flight Safety cannot be guaranteed when the CSF inhibited on the Flt Control System Aux Unit with AFCS modes engaged.
What mode must the Flying Pilot have displayed on his MFD?
Flying Pilot MUST have FND displayed on one of his MFDs.
How many minutes are specified for Gyro Compass alignment?
Wait at least 4 mins for GC alignment. Optimum is 8 min GC alignment. Failure to align may result in 8NM per hour drift.
Can you use AFCS collective modes for Rope or Rappell and Hoist?
Yes when >40 ft.
What are the minimum DH and MDH in approach modes?
DH=200 ft AGL. DSH=250ft AGL.
Maximum ground speeds to prevent CSF intervention on different approach angles?
4 deg or less = 140 KT. 5 deg or less = 100 KT. 7 deg or less = 70 KT.
What is the maximum speed for ILS intercept?
What happens if you change the ILS course after engagement of LOC/GS?
If you change the course the helicopter will immediately turn to intercept the new course.
What is the restriction on the HF during VOR/LOC approaches?
Do not tune or transmit in the 3-12 Mhz r
What is the max load on the hook?
What are the cargo hook AoB limits?
2000 Kg = 110KTS Max. >2000 Kg = 90KTS Max. 30 deg AoB max.
What is the max hoist load on the ground and in the air?
Ground is 400Kg. Air is 270Kg.
What is the max weight on ramp when closed or horizontal?
Actuators to tip is 200 Kg.
What is the max vehicle loading via rear ramp?
What must be selected in the cockpit when flying with ramp or hatch open?
The RHEAS power switch must be off unless using the ramp.
What restrictions apply to operating the ramp from the cockpit?
Permitted provided you allow a 5 second break between opening and closing cycles.
What is the max nose up during takeoff/landing with the ramp horizontal?
Max 10 deg nose up.
What are the wind limits at low airspeed or hover up to 10600Kg?
Sidewards 48KTS up to 4500ft DA. Rearwards 35KTS up to 4500ft DA.
What are the wind limits at low airspeed or hover when > 10600Kg?
30KTS or the lesser value from the 10600Kg chart.
Efficiency Meter Limits AEO are?
96% MCP. 100% 30 min. 101.5% 20s.
Efficiency Meter Limits OEI are?
100.5% OEI MCP. 105% OEI 2 min. 114% OEI 30s.
What is the max residual Nf for ENG start?
Max residual Nf 2%. Otherwise you m ay cause 'ENG' on CWP and 'OVSP F' on VMD.
When must you abort a main engine start?
No light-up in 20s. No Rotor by 30% Ng. Stagnation after light up >10s. No IDLE within 45s of starter cut off. Starter Not disengaged by 68% Ng(38% Em). T4 750-840deg >20s. T4 >840 deg.
What is start stagnation?
Interrupted rise of Ng/Em when <50%Ng (30%Em) following engine light up.