-------------------------------------------------------------------------------INSPECT/CHECK MAXIMUM REMARKS SERVICEABLE LIMITS -------------------------------------------------------------------------------
A. Cracks
B. Nick, Scratch, Gouge
C. Nick, Scratch, Gouge
R R 4. Examine the forward engine mount bolts, look for: A. Cracks
B. Damaged threads
None permitted
None permitted in the critical areas (AreaA)
Maximum depth 0.05 in.
(1.27 mm). Maximum length 0.25 in. (6.35 mm) in the non-critical areas. (Area B)
None permitted
None permitted If cracks are found replace the mount (Ref. TASK 71-21-11-000-041) and (Ref. TASK 71-21-11-400-041).
If damage is found replacethe mount (Ref. TASK 71-21-11-000-041) and (Ref. TASK 71-21-11-400-041).
Make smooth the area per(Ref. CMM 712108). Adamagearea can not be madesmooth more than one time.
If the bolts are cracked replace it one at a time (Ref. TASK 71-21-11-400-045) and (Ref. TASK 71-21-11-000-045).
If the threads are damaged, replace the bolt (Ref. TASK 71-21-11-400-045) and (Ref. TASK 71-21-11-000-045).
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________ Subtask 71-21-11-410-056
A. Close Access
(1) Make sure that the work area is clean and clear of tool(s) and other items.
(2) Close the thrust reverser doors (Ref. TASK 78-36-00-410-040): FOR 1000EM1 451AL, 452AR FOR 1000EM2 461AL, 462AR
Subtask 71-21-11-440-051
B. Make the thrust reverser serviceable (Ref. TASK 78-30-00-081-041). Subtask 71-21-11-410-058
C. Close Access
(1) Close the fan cowl doors (Ref. TASK 71-13-00-410-040):
FOR 1000EM1
437AL, 438AR
FOR 1000EM2
447AL, 448AR
(2) Remove the access platform(s).
(3) Remove the warning notice(s).
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TASK 71-21-11-210-042
Detailed Visual Inspection of the Forward Engine Mount with the Engine Removed
1. Reason for the Job
__________________
Refer to the MPD TASK: 712111-02
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
R 71-21-11-000-041 Removal of the Forward Engine Mount R 71-21-11-400-041 Installation of the Forward Engine Mount CMM 71-21-08
3. Job Set-up
__________
Subtask 71-21-11-020-060 R A. Get Access R (1) Remove the Forward Engine Mount (Ref. TASK 71-21-11-000-041).
4. Procedure
_________
Subtask 71-21-11-210-054
A. Do a detailed visual inspection of the forward engine mount. (Ref. CMM 71-21-08)
5. Close-up
________
Subtask 71-21-11-410-064
A. Close Access R (1) Install the Forward Engine Mount (Ref. TASK 71-21-11-400-041).
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AFT MOUNT - DESCRIPTION AND OPERATION
_____________________________________
1. Description
___________ (Ref. Fig. 001) The aft mount connects the engine turbine rear frame with the engine pylon via a beam. The aft mount takes the loads in the plane normal to the engine centerline,
i.e. y, z loads and Mx. The aft mount is a damage tolerant design. It
consists of 3 links and a crossbeam assembly.
There is a possibility of axial translation movement between the engine
casing and the pylon since :
- the three links are located in the same plane normal to the engine
centerline
- the link end have bearings.
There is a possibility of axial translation movement between the engine
casing and the pylon.
This allows for casing expansions of about 0.236 in. (6 mm) in cruise and
0.295 in. (7.5 mm) at maximum thrust.
The lugs are located on the upper part of the turbine rear frame. Their
angular position is plus or minus 56.25 degrees for the lateral lugs and
