DQ additionals Flashcards
164M1. Miscompare Threshold - Main Fuel Quantity 10.0 lbs
M2. Rotor Brake
Safety devices:
- The rotor brake interlock prevents moving the ENG POWER CONT lever above IDLE when the rotor brake is engaged - unless the interlock tab is manually released by pulling on the tab.
- A T-shaped rotor brake handle lock pin is provided to prevent inadvertent release once the brake has been applied. To set the pin after the rotor brake is applied, rotate the pin 90° and push the pin inward until it seats into a hole on the lever arm. To release the pin, pull and rotate the pin 90°.
9.31.1 ROTOR BRAKE ON Advisory Appears in Flight.
May indicate rotor brake pressure is applied to the rotor brake.
- Rotor brake handle — Check in detent and gage pressure at zero.
- Check for secondary indications of brake pad dragging (smoke, smell, noise, etc.).
If secondary indications present:
3. LAND AS SOON AS POSSIBLE.
If no secondary indications present:
- LAND AS SOON AS PRACTICABLE.
164 M3. Inner- & Outer Loop
Dual Digital Flight Control Computers. The central component of the AFCS system is the two redundant FCCs. Each computer receives signals from the pilots’ controls, motion sensors, control panels, and avionics systems to compute commands which are sent to the cockpit, trim actuators, SAS actuators, and stabilator actuators.
The computers command Inner-loop SAS actuatorsinpitch, roll, and yaw and the;
Outer-loop trim actuators in collective, pitch, roll, and yaw control channels. The computers also provide: self monitoring, fault isolation, and failure alerts, and advisory and caution indications.
The AFCS provides two types of control, identified as inner-loop and outer-loop.
The inner-loop (SAS) employs rate damping to improve helicopter stability, this system is fast in response, limited in authority, and operates without causing movement of the flight controls.
The outer-loop (Trim) provides long-term inputs by trimming the flight controls to the position required to maintain the selected flight attitude. It is capable of driving the flight controls throughout their full range of travel (100% authority) at a limited rate of 10% per second.
Both inner and outer loops allow for complete pilot override through the normal use of the flight controls.
The FCCs process incoming information from various sensors aboard the helicopter and stores this information in its memory. The sensor information is used by the computer Central Processing Unit (CPU) to compute required correction signals. Inner-loop correction signals are routed to the SAS actuators and outer-loop signals are routed to trim servos and actuators.
165 M1
Instrument flight - ILS
ILS Deceleration (DECL) Mode. **_NOTE:_** RALT is required for the DECL mode to be engaged.
The ILS DECL provides a means to automatically decelerate the helicopter from its present airspeed to 70 knots prior to the 200-foot AGL point on the glide slope. Once the DECL mode achieves 70 knots, the IAS mode will automatically engage and the DECL mode will disengage. The airspeed for engagement of the DECL mode is 70 knots or greater. The DECL legend is displayed on the FD/DCP when a ILS source is selected as the NAV source for the corresponding FD. IAS, LOC, and GS must already be engaged in order to engage the DECL mode. The helicopter’s present altitude (AGL) and air- speed must be such that the DECL mode can achieve 70 knots prior to 200 feet AGL with a 0.5 knot per second deceleration rate. DECL will not engage if this criteria is not met. The DECL mode is manually engaged by pressing the DECL button on the corresponding FD/DCP.
a. The DECL mode has two states, either the ARM or CAP state. The DECL pushbutton on the corresponding FD/DCP illuminates amber when the DECL mode is engaged and armed. ARM is displayed in green on the FD/DCP when the DECL mode is armed. DECL will il- luminate white in the vertical arm FD mode annunciation field on all on-side PFDs when the mode is engaged and armed.
b. The DECL pushbutton on the corresponding FD/ DCP will illuminate green when the DECL mode is captured. CAP will be displayed in green when the DECL mode is captured. DECL will also illuminate green in the pitch capture FD annunciation field on all on-side PFDs. A pitch FD cue will be displayed on all on-side PFDs when mode is captured. The on-side FD airspeed bug will decrease from its present airspeed down to 70 knots at 0.5 knots per second upon DECL CAP mode engagement.
NOTE
- Disengagement of the LOC and/or GS mode for any reason will immediately disengage the DECL mode.
- Disengagement of the IAS mode for any reason while DECL is armed will im- mediately disengage the DECL mode.
Back-Course - BC
2.72.14 ILS Back Course (BC) Mode. NOTE
The BC mode can only be engaged when the on-side PFDs referenced to magnetic north.
The BC mode operates similar to the LOC mode except it is flown to the back side of the course needle. LOC front course must be selected with the OBS knob for proper operation of the BC mode. The BC mode only provides roll steering commands. The mode can only be engaged at indicated airspeeds of 50 knots and above. The BC legend is displayed on the FD/DCP when a localizer source is selected by the NAV SRC knob as the NAV source for the corresponding FD and when the difference between the selected course and the actual heading is less than 105°. The mode can be engaged only when the BC legend is displayed on the FD/DCP. The BC mode can only be engaged when a valid ILS frequency is tuned and the FCC is receiving a valid localizer signal. The BC mode is manually engaged by pressing the BC button on the corresponding FD/DCP. The OBS knob is used for making adjustments to the selected course for the corresponding FD.
a. The BC mode has two states, either the ARM or CAP state. The BC pushbutton on the corresponding FD/ DCP illuminates amber when the BC mode is armed. ARM is displayed in green when the BC mode is armed. BC will illuminate white in the roll arm FD mode annunciation field on all on-side PFDs when the BC mode is armed.
b. The BC pushbutton on the corresponding FD/DCP will illuminate green when the BC mode is captured. The CAP will be displayed in green when the BC mode is engaged and captured. BC will also illuminate green in the roll capture FD annunciation field on all on-side PFDs. A roll FD cue will be displayed on all on-side PFDs when BC mode is engaged and captured.
c. The BC ARM or BC CAP can be manually deselected by pressing the BC mode pushbutton on the FD/DCP or by pressing the RMT SBY button on the cyclic grip.
ILS Level-OFF
2.72.13.2 ILS Glide Slope Mode.
NOTE
The GS mode can only be engaged when the on-side PFDs are referenced to magnetic north.
The GS mode provides intercept and tracking of a glide slope signal and automatically commands the helicopter to level off at 50 feet AGL. The ILS source is selected by the NAV SRC knob on the corresponding FD/DCP. The GS mode can only be engaged at indicated airspeeds of 50 knots and above. The GS legend is displayed on the FD/ DCP when a ILS source is selected as the NAV source for the corresponding FD. When the GS legend is displayed on the FD/DCP and a valid ILS frequency is tuned and the FCC is receiving a valid localizer and glide slope signal the GS mode can be engaged. The GS mode is manually engaged by pressing the GS button on the corresponding FD/DCP.
a. The GS mode has two states, either the ARM or CAP state. The GS pushbutton on the corresponding FD/ DCP illuminates amber when the GS mode is engaged and armed. ARM is displayed in green on the FD/DCP when the GS mode is armed. GS will illuminate white in the vertical arm FD mode annunciation field on all on-side PFDs when the mode is engaged and armed.
NOTE
The auto level function will not operate if the radar altimeter is inoperative during the ILS approach.
b. The GS pushbutton on the corresponding FD/DCP will illuminate green when the GS mode is captured. CAP will be displayed in green when the GS mode is captured. (GS will not capture unless LOC is captured first.)GS will also illuminate green in the collective capture FD an- nunciation field on all on-side PFDs. A collective FD cue will be displayed on all on-side PFDs when GS mode is captured. The GS CAP mode provides an auto level func- tion to automatically level off the helicopter at 50 feet AGL if the helicopter is allowed to follow the glide slope below decision height (DH). During the auto level function the CAP annunciation on the FD/DCP will change to ALVL when the FCC is commanding the level off, then radar altimeter hold mode will engage at 50 feet.
NOTE
Disengagement of the LOC mode for any reason will immediately disengage the GS mode.
