Emergencies Flashcards
Parameters that cause PMU to abort a start
Weak battery High OAT high prestart ITT HIGH DA Tailwind
Manually abort
ITT rate of increase appears likely to exceed 1000 C (hot start)
Normal N1 increase is halted (hung start)
No rise of ITT is evident with 10 sec after fuel flow (no start)
Red BATT Bus on right EICAS (never going to happen)
PCL is moved or ST READY green advisory message extinguishes during the start sequence
Reasons for motoring
Any aborted start during which fuel was introduced
Motor the engine to clear residual fuel and/or lower the ITT
Motoring
PCL- off Ign- norm Prop- clear Starter switch- manual for 20 sec Starter switch- norm
Reasons for emergency engine shutdown
Engine fire Prop strike Chip light Likely to depart the prepared surface Or any other reason
Emergency engine shutdown
PCL- off
Firewall shutoff handle- pull
Emergency ground egress- as req
Reasons to take off or abort
Runway length and condition
Terminal weather conditions and area traffic
System emergency affecting safety prior to liftoff
Abort
PCL- idle
Brakes- as req
Warning:
Do not taxi into or park in a congested area if max effort braking used. Do not set parking brake
Tire failure during TO
If the decision is made to stop:
1. Abort
If TO is continued:
2. Gear and flaps position- do not change
3. Straight in approach- execute
Land on side of runway of good tire (put drag in the middle)
Maintain directional control with rudder, brakes, or NWS
Complete engine failure indications
Total loss of power
Fairly rapid reduction in airspeed
Engine failure immediately after TO
1. Airspeed- 110 kts min A positive nose down pitch change will be needed 2. PCL- as req Select idle to increase drag Select off to reduced sink rate 3. Emergency LDG GR handle- pull 4. Flaps- as req.
Maximum breaking action
A smooth single application, increasing as airspeed decreases, offers the best braking opportunity.
Not equipped with anti-skid or anti-lock protection
Weight fully on wheels
Breaking caution speed
80 kias
Greater chance achieved below this value
Loss of brake effectiveness
Fully release brakes
Then reapply
Maximum abort speed
The maximum speed at which an abort may be started and the aircraft stopped within the remaining runway length
Maximum braking speed
The max speed from which the aircraft can be brought to a stop without exceeding the maximum design energy absorption capability of the brakes (3.96 million ft-lb)
CFS and ejection procedures from the ground
Coordinate “CFS- rotate and pull” using internal CFS handles between front and rear cockpits
Ensure O2 mask and visor
Internal-only respective
External- both
Don’t un strap unless sure canopy is open
PTSD INDICATIONS
The propeller moves toward feather due to a temporary loss of oil pressure to the propeller pitch control mechanism.
Fluctuations in Np, TQ increasing, thrust decreasing, and engine vibrations
20 sec duration
Chip detector warning
PTSD PMU off
Oil pressure and volume output to the propeller pitch control increase
May be sufficient enough to overcome localized reduction in oil pressure caused by propsleve touchdown and restore propeller control
Uncommanded changes in power/loss of power/feathering (attempted reset)
PCL-mid range
*midway position between idle and max
*above idle provides best chance
*minimize chances of over torque and/or over temperature
PMU- off
*itt limits potentially > 820
*increase landing distance higher N1 ~67%
If Np stable below 40%, prop SYS CB- pull
*stable: 3 sec period
*Np red Xs: PMU off then norm can reset it
*prop should unfeather 15-20 sec
PCL- as req
Air start demands
~1200 feet of altitude lost
@ best glide speed of 125 kias
~ 40 sec
Below 2000 eject
Hyd fl Lo
Below 1800 psi
Dropped below 1 qt
Chip detector warning
- PCL- minimum necessary to intercept ELP; avoid unnecessary PCL movements
- PEL- execute
Oil PX warning illuminates and oil pressure is normal
Check oil TRX CB on BAT BUS. Reset if open