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 TASK 05-50-00-810-801
 Identification of the Cause of In-Flight Airframe Vibrations and/or Noises
 1. Possible Causes

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 2. Job Set-up Information

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 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
27-10-00-810-835 Vibrations Felt in the Forward Cabin and Cockpit 27-10-00-810-840 Aileron Oscillations
R  27-20-00-810-802 Airframe Vibration due to the Rudder 27-30-00-810-849 Vibrations Felt Along the Cabin and in the Cockpit 27-30-00-810-850 Vibrations Felt in the Rear Cabin 27-54-00-810-801 Flap Vibration 32-20-00-810-803 Vibrations Felt during Climb because of Incorrect
 Clearance of the NLG Aft Doors 52-11-00-810-826 Vibrations and Noise in the FWD Passenger/Crew Door Area 52-13-00-810-826 Vibrations and Noise in the Aft Passenger/Crew Door
 Area
 53-35-00-810-801 Vibration and/or Noise felt in Mid Cabin
 05-50-00-991-001 Fig. 201
 05-50-00-991-002 Fig. 202
 05-50-00-991-003 Fig. 203
 05-50-00-991-004 Fig. 204
 05-50-00-991-005 Fig. 205
 05-50-00-991-006 Fig. 206

 3. Fault Confirmation
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 A. Find the Cause of the Vibrations and/or noises
 NOTE : If the vibrations occurred in this configuration:
____
 - vibrations along the cabin and in the cockpit and

 - elevator control with SECs active and ELACs not active, no trouble shooting is necessary (elevator oscillations are wider in SEC mode than ELAC mode).

 (1) Use this procedure to find the cause of the vibrations. (Ref. Fig. 201/TASK 05-50-00-991-001)
 (a) Vibration reporting sheet. (Ref. Fig. 202/TASK 05-50-00-991-002) If vibrations occur, the airline must record the related data on the vibration reporting sheet. You must use this sheet to start all trouble shooting procedures related to vibrations.
 NOTE : The more accurately the airline records the data on this
____ sheet, the easier the trouble shooting will be.
 (b) Decision tree.
 (Ref. Fig. 203/TASK 05-50-00-991-003)
 Refer to the decision tree and the data on the vibration
 reporting sheet to find:

 - the source of the vibrations

 - the type of corrective actions that are necessary. If you cannot find the cause of the vibrations with this tree, use the decision table.

 (c) Decision table. (Ref. Fig. 204/TASK 05-50-00-991-004) The decision table is made to help the operator to find the possible causes of the vibrations. Each line of the table is related to one of the parameters shown on the vibration reporting sheet. If this parameter is applicable (there is data for it in the vibration reporting sheet), you must highlight all the figures on the line for the parameter. When all the applicable lines are highlighted, add all the highlighted figures in each vertical column. Record the total on the TOTAL line. The highest totals show the most probable sources.

 NOTE : Item with a value below 20 are not significant.
____
 (d) Example of utilization of the decision tree and the decision table. (Ref. Fig. 205/TASK 05-50-00-991-005, 206/TASK 05-50-00-991-006)
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 May 01/03R
 CES

 Process for the Identification of the Vibration Source
 Figure 201/TASK 05-50-00-991-001

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 May 01/03 CES

R Vibration Reporting Sheet Figure 202/TASK 05-50-00-991-002
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 Aug 01/05 CES

 Decision Tree
 Figure 203/TASK 05-50-00-991-003

 一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一 R EFF : ALL ∞∞05-50-00∞∞∞∞∞∞∞∞∞∞Page 205
 May 01/03 CES

R Decision Table Figure 204/TASK 05-50-00-991-004
　
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