新航排故秘籍.docx

1、新航排故秘籍Chapter 21 Air Conditioning1. What can cause a Pack to trip?Ans: RAI & RAE out of sequence, Pack Discharge Overtemp & Compressor Discharge Overheat sensor failure, Turbine bypass valve failure, Air Cycle Machine failure, Pack Control Shut-Off Valve failure and wrongly install of the water sepa

2、rators in the reverse direction (underwear/socks). 2. How does the aircraft maintain its temperature in the different zones?Ans: Cabin Temp Selector ZTC Zone Trim Air Modulating Valve.3. Pilots complain cockpit temperature too hot or too cold, what are the causes for fluctuation of cabin temperature

3、?Ans: Flt Deck Zone Trim Air Valve or Flt Deck Zone Temp Sensor.4. What happens when equipment cooling fails?Ans: Gnd crew warning horn will sound, EICAS msg “EQUIP COOLING” and Gnd Exhaust Valve will close.5. In case of fire in air or on gnd, what happens to the equipment cooling?Ans: 6. What are t

4、he causes for equipment cooling failure?Ans: E/E air supply overtemp (overheat switch temp 145F), Flt deck low flow, E/E low flow, Smoke Detector, Gnd Exhaust v/v out of position, and any failure of E/E cooling air exhaust fan, Inboard exhaust v/v and Bypass v/v.7. F/O while doing his pre-departure

5、WAC found that the Gnd Exhaust Valve is in the “CLOSED” position; however there wasnt any gnd crew horn. What is the likely scenario?Ans: 8. What are the modes of equipment cooling, any special ones?Ans: NORM, STBY and OVERRIDE modes. 9. What is the purpose of cabin pressurization, and how does it c

6、ontrols the set ambient pressure? What is the STD cabin pressure set at?Ans: Pressurization of the aircraft is to maintain a safe and comfortable cabin pressure by controlling the size of the openings where air leaves the cabin. The air leaves thru two outflow valves which are driven more open to de

7、crease cabin pressure or more closed to increase cabin pressure. The CPCS limits the rate of change of cabin pressure and controls the cabin-to-ambient pressure differential. The STD cabin pressure is usually set at around 8500ft.10. What are the dangers of overpressurization, is there any protectio

8、n to counter these situation? What should you do after that?Ans: After an overpressure condition has been relieved the valve gate closes but the blowout doors will remain open to provide a positive visual indication that an overpressure condition has occurred.If above condition exists, refer to PAGE

9、BLOCK 05-51-27/201 and carry out conditional inspection procedure for Cabin Overpressurization event.11. Pilot complains he is unable to maintain cabin pressure using two packs; the other pack was u/s and locked out. What should you do now?Ans: Interrogate the CMC for Existing Faults on Chap. 21-Cab

10、in Pressure and rectify any faults found. If there are no faults registered then refer to PAGEBLOCK 05-51-08/201 and carry out conditional inspection procedure for Excessive Cabin Pressure Leakage Condition.12. What kind of protection does the aircraft have against other abnormal pressurization cond

11、ition?Ans: Chapter 22 - Autoflight13. How do AFDS helps the aircraft to maintain SLF? Does it use the Primary or Secondary flight controls?Ans: 14. What are the inputs to A/P and what are the different modes of A/P?Ans: FMC, IRU, ADC, LRRA, GPWC, Primary Air/Gnd Relay, FCU, Loc & G/S antenna, ILS, B

12、CU, HYDIM, Go-Around Switch and CMC. The different modes are: A/T, Mach Trim, Yaw Damper System, Speed Trim & Automatic Stabilizer Trim System.15. Pilot complains that the airplane was porpoising throughout the flight with any A/P in CMD, what should you do?Ans: You should perform Elevator Control S

13、ystem Adjustment/Test (AMM PAGEBLOCK 27-31-00/501).16. Can you engage any of the A/P modes on Gnd, which mode is it?Ans: 17. What can cause the A/P to drop off (disengage)? Failure of ADC, LRRA and ILS An elevator or aileron servo camout monitor was tripped An automatic stabilizer trim failure when

14、the servos are engaged A/P in flare mode with only one channel engaged in CMD mode Local inner loop data invalid in the F/D mode ALT hold or override mode cannot be engaged within 4 secs ADC inner loop signals invalid for 4 secs Self test failures occur in ILS or RA receivers Manual disconnection by

15、 pilot18. How does the A/P command flows from the cockpit to and flow the flight controls?Ans: MCP FCC Servo Actuators position feedbacks cockpit. 19. What mode does our freighter uses, Speed or Mach trim, what is the difference?Ans: Mach Trim modes are employed in all freighters. The main differenc

16、e is the Speed trim provides a much smoother transition with new speed changes.20. What happens in Dutch Roll or Side Slip conditions?Ans: 21. After a/c landed, Captain notes that airplane bank angle was limited to 8 degrees in Roll with any A/P in CMD. What should you do?Ans: Perform LRRA Self-Test

17、/BITE Procedure (34-33 FAULT TRESS Figure 103, Block 1). If the problem continues, do the radio antenna and coax check (AMM PAGEBLOCK 34-33-03/401). If the still persists, replace the selected Flight Control Computer (AMM PAGEBLOCK 22-11-01/401). 22. Can you do A/P test on ground?Ans: Yes you can ca

18、rry out Autoland Unique, Aileron Servo, Elevator Servo and Rudder Servo interactive test on ground.23. Pilot complains, A/P refuse to engage in flight after drop out, everything else normal, what are the likely causes?Ans: It could be MCP fault, A/P Disconnect switch on control column stuck or FCC f

19、ail. In remote situation the re-sync of FMC or disagreement of FMC can cause this too.24. During roll-out (take-off), A/T suddenly disconnected, what is the likely cause?Ans: EEC in degraded mode or the N2 Speed card of a particular engine fails during Roll-Out which causes the EEC to degrade to ALT

20、N mode. A/T is not available in ALTN (N1) mode; therefore if one engine is in ALTN all other serviceable engines have to be selected to ALTN (N1) mode. Airplane id dispatched using the appropriate performance data for the Alternate EEC Mode Operation. 25. Pilots complain Throttle levers do not move

21、together during A/T operation, what should you do?Ans: Perform Thrust Lever Assembly Adjustment (AMM PAGEBLOCK 76-11-01/501). If the problem continues, replace the A/T brake shaft assembly (AMM PAGEBLOCK 76-11-05/401).Chapter 23 - Communications26. What is the purpose of static dischargers?Ans: Stat

22、ic dischargers are installed on the airplane to reduce radio interference. This interference is caused by a corona discharge emitted from the airplane surface as a result of precipitation static and engine charging.27. Where can you find the SELCAL codes?Ans: It is placed on the F/O side below the N

23、D. It is a four letter code unique to this aircraft.28. SELCAL defect and you have just replaced the item, how do you test the SELCAL operationally?Ans: Tune your radio to a known radio station either using the VHF or HF system. Request SELCAL codes for your aircraft and listen for the two tone chim

24、e and the “Call” light on all audio control panels.29. Captain noted the SELCAL calls do not sound the chime but the Call light did illuminates, what could be the problem? What if the SELCAL calls do not illuminate Call Light?Ans: If the SELCAL calls dont sound then it is likely that the Crew Alerti

25、ng Card (AMM 31-51-02/401) in MAWEA at the right hand crawl-way is faulty. If the SELCAL calls dont light then it is probably the SELCAL decoder (AMM 23-28-02/401).30. How does the ACARS transmit, can we do an interactive test to make sure it works?Ans: ACARS is transmitted using the VHF-C, HF or th

26、e SATCOM. You can key in a test report and send it to OCC or request Wxr Report from CAAC.31. Where is the fixed ELT located and how do you know if its really working?Ans? The fixed ELT is located in between the main side cargo door and D5R on the ceiling top. You can do a manual “ON” test with some

27、one in cockpit to listen out for the distress signal when switch “ON”. Alternatively, you can put it in “ARM” position and vigorously shake the ELT to activate the G-switch, which will transmit the distress signal.32. Pilot complains the SATCOM signal strength is very weak, where do you look?Ans: Ch

28、eck Existing faults for Chap 23 SATCOM and rectify any faults found. If there are no existing faults, do an inspection of the SATCOM antenna and its connectors.33. How many channels are there for SATCOM?Ans: There are 6 channels for SATCOM, 1 for Capt, 1 for F/O, 2 for data and 2 for passengers.34.

29、Pilot complain HF not working, after resetting CB message goes away, how do you convince him to take the aircraft?Ans: Tune to a known radio station then clock the time required for the Coupler to tune to the station. Make sure it is less than 15 secs. After that establish call with the station and

30、check the reception on both sides.35. When does the CVR works and when does it shut down?Ans: The CVR starts recording when any engine is started and it stops working when the last engine is shutdown plus 5 minutes.36. How do you test the four CVR channels?Plug headset into the control panel, then s

31、witch it from “AUTO” to “ON”. Press the Test button and make sure you can see the needle moves and a 600hz tone. After that, talk into the area mic and make sure you can be heard. Follow that plug into the Captain, F/O and First Observer headset jack and make sure you can hear your own voice when es

32、tablishing a call.Chapter 24 Electrical Power37. Describe a simple power distribution.Ans:38. What is the priority of AC power on Gnd?Ans: If engines are started, ENG Ext power APU.39. Can like source power be parallel, how about unlike sources?Ans: Only Engines power can be parallel together, the rest of the power sources cannot be parallel.40. Pilot experience momentarily power interruption when he switches to different power sources, what can be the cause?A