The first part of this video was officially declassified by Czech army.
The second part of this video is classified and inaccessible to the public.
English translate (by PaletoB)
External Inspection & Engine Test
Military attack helicopter Mi-24D is intended for filling the demanding assignments of contemporary battle.
In order for the helicopter to fulfill this role reliably and safely, it’s required that the helicopter crew with the cooperation of military engineers perform critical checks before each flight.
The crew commander directs the onboard technician to begin the engine tests.
The crew first checks the aircraft exterior. Checks are made to the fuselage surfaces, the wings, and weapon hardpoints.
Particular thought is brought to the main and rear rotors.
In a sequence they also check the undercarriage, tail beam, stabilizers and balancing rotor.
Completeness of signal lights.
Pressure of the air in the air system
All covers and containers must be removed from the fuselage and special equipment
The external check is performed in a precisely determined course
Helicopter hand over is confirmed with signatures in the preparations log book
Before stepping into the cabin, the pilot checks air intakes above the cabin do not contain any foreign objects
After seating the crew performs preparatory checking tasks, before starting the engines. This includes, for example setting the onboard clock, setting barometer values, and similar.
Centralized control levers are used to enable all required section switches on the right and left rear switch panels
Onboard battery test is performed, and as a burden the fuel pumps are switched on for the necessary fuel tanks. And a test is performed on each individual DC circuit. The voltage must measure 24 volts at minimum.
After the tests, the fuel pumps are turned off.
For the turbo-air running engine AI-9V, and for checking other systems, in normal situations ground external electricity is used. Connection of this resources is signaled by the illumination of the indicator panel
At this time, the correct seating position is adjusted, brake tests for the landing gear performed, and the motion of the heel and cyclic steering.
Before testing the fuel indicators it’s necessary to enable the changer PO-750. The fuel indicator shows the amount of fuel in the tanks helicopter.
Before further steps, it’s necessary to enable switches for the intercom SPU-8, and recording equipment SARPP-12
[The pilot/crew] Monitors that the temperature of the exhaust gases gauge is working (test), and indicator for engine vibration EV-500
The fire extinguisher system test is performed, and also switched on with the appropriate switches [panel indicator lights speak in Russian]
And further, switching on the fuel pumps, turning on the cut-off valves, and valves for the consumable fuel tanks.
Monitor the checks for heating the pitot tubes, and we finish the checks with equipment for vocal information RE-65
Equipment is checked with a preliminary visual check of all signal boards [panel indicator lights]
The most important indicator panels flash for enabled switches
Before the actual engine start, the throttle must be in the full left position, and the two engine brakes are laid down to idle
During engine start, it’s necessary to consider the speed and direction of the wind. If the wind is 10 metres per second or less, you can start the engines [when helicopter is facing] in any position relative to the wind direction.At up to 25 metres per second, it’s necessary to turn the helicopter into the direction of the wind.
In higher wind speeds, starting engines is forbidden.
On the mechanic’s signal the pilot turns on the engine AI-9V. Working activity is shown by the appropriate panel indicators.
Engine start up should be ceased using the button for engine AI-9V in the follow circumstances:
-if the temperature doesn’t change within 9 seconds of pressing the ignition button
-if the electrical voltage drops below 18 volts
-if the exhaust gases surpass 880 degrees celsius
-if the panel indicator“Speed AI-9V Normal” does not light up within 20 seconds of the pressing ignition button
-if the panel indicator“Automatic On” does not light up within 30 seconds of the pressing ignition button
-if the “Speed AI-9V High” has illuminated
-during any sort of abnormal running of the AI-9V engines or at the instruction of any observational staff
Once engines are running at full idle, the ground power is unplugged
Turboshaft engines TV-3-117 are started depending on the direction of the wind. The engine on the windy side is started up first.
At the signal of the mechanic, the pilot presses the ignition of the nominated engine, and the corresponding stopcock
During ignition, the pilot monitors the rotation of the main rotor, [on the RPM gauge] the running of the turbo compressor, and the temperature of the exhaust gasses. The change to engine idle is automatic.
The same procedure is performed for the 2nd engine ignition
The parameters of the driving cluster through the course must match those of the start up regime necessary to cease the running of the Engine TV-3-117 during the following circumstances:
if the air intakes of the turbo compressor did not disengage during 66 + 1% RPM
-if the “Automatic ON” indicator either doesn’t light up, or doesn’t stop being illuminated during 33 seconds
-if exhaust gases or RPM of turbo compressor exceeds temperatures for more than 3 seconds
-if the main rotator doesn’t reach more than or equal to 25%
-if there are any discrepancies in the values between the panel indicators and start-up regime
-or at the instruction of any observational staff
While the engines are warming up, check pressure of the main, standby, and auxiliary hydraulic systems
After the warm up of the individual aggregate groups, the pilot works with the onboard technician check of the regulators RPR-3-A
After one minute of engines being in idle the hand throttle is moved to the right to provide partial acceleration, testing the rate of acceleration that should last between 3 up to 6 seconds, and the RPM of the engines, and the temperature of the gas in front of the turbo must not exceed the documented values.
Testing of individual engines must be done prior to detachment of the helicopter. All values of RPM, pressure, and temperature must match those of the start up regime. After the testing is complete the engine levers are placed back to idle.
When setting the collective lever to 3 degrees, check that the rotation of the main rotor is adjustable between 91 +- 2 through to 97 +2 or -1 percent
14:43 When the main rotor reaches 95% RPM, turn on the generators, transformers and rectifiers, and turn off generator AI-9V and voltage switch PO-750.On the left side switch panel enable the switch for the radio navigation DIS-15, gyros 1 and 2. Turn on tape recorder MS-61, and device SRO on - engine AI-9V is switched off.
After checking appropriate function of radio devices, perform in conjunction with gyros, enable positional device PKP-72.
Upon enabling the switch for the course system, plug in the autopilot channels. After 3 minutes perform an agreement test of the course system, and enable the direction channel of the autopilot.
Prior to flight, communication radios are checked to ensure military station[channels] are functional UKV station 860. Radio compass and RK-15. And navigation device DIS-15 with cartographic indicator.
Further perform activities on the climatization system
Check of anti freeze devices - the values of each section must correspond to documented values.
Check of the water spray and windscreen wipers
Performing the required checks and procedures is the most important part for successful fulfillment of the next duties of the helicopter Mi-24D in flight, and this is the key for flawless functionality of this modern armament of the Czechoslovakian People’s Army.