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6. REPAIR - HEAT EXCHANGER (Figure 202)
A. Tools and consumable materials
- Abrasive disc [thickness 0.06 in (1.5 mm)]
B. Heat exchanger repair
Two forms of damage should be considered :
Case No. 1 : inner surface deformed but not cracked. Case No. 2 : inner surface deformed and cracked.
1) Case No. 1 repair
a) Straighten out the inner surface.
b) Using an abrasive disc, cut two diametrically opposite grooves, 0.06 in (1.5 mm) wide, in the middle of the heat exchanger on the inner surface. The grooves must have a rounded end with a 0.03 in (0.75 mm) radius and stop at 0.02 in (0.5 mm) from the outer surface, without damaging the inner surface on the outer surface, which may cause crack initiation.
2) Case No. 2 repair
a) Straighten out the inner surface.
b) Using an abrasive disc, confirm the crack(s) by cutting one or several grooves 0.06 in (1.5 mm) wide. The latter should be indentical to those in case No. 1.
NOTE : If cracks are too numerous or excessive in size, the heat exchanger must be discarded.
ABAA
Validity : S / N 1 - 9999 21-40 01 Page 203
(EA) AUG 01
 
 
Heat exchanger - Repair
Figure 202
ABAA
Validity : S / N 1 - 9999 21 40 01Page 204
(EA) AUG 01
 
CABIN AIR MIXER
MAINTENANCE PRACTICES
1. SERVICING
None
2. REMOVAL / INSTALLATION - CABIN AIR MIXER (Figure 201)
A. Tools and consumable materials
- Clean lintfree cloths
- Oil (TB 03-900)
B. Removal of the cabin air mixer
1) Remove the engine cowlings - refer to 71-10-01.
2) Remove the R.H. instrument panel (if installed).
3) Remove the closing plate of the R.H. panel.
4) Remove the attachments of cables (5) and (7) on control box (6).
5) Disconnect cables (5) and (7) from control box (6).
6) Remove protector (8) from cable (7).
7) Disconnect, on cabin air mixer (9) side, regulated air distribution hoses (2), (11) and (10) of windshield diffuser (1), rear bench diffuser (12) and pilot seat. Retain clamps (13).
8) Disconnect, on cabin air mixer (9) side, hose (3) of R.H. NACA air intake (4). Retain clamp (13).
9) Remove the 3 upper attachment bolts (16), the 4 side attachment bolts (19) on cabin side. Retain washers (21), discard nuts (22).
10) Hold cabin air mixer (9). Remove both upper bolts (17). Retain thickness washers (14) and washers (21). Discard nuts (22).
11) Disengage the box equipped with shutter (20) and cables (5) and (7). Discard seal (15).
C. Installation of the cabin air mixer
1) Before installation, inspect the hoses for condition. Replace if necessary.
NOTE : If new hose(s) is (are) installed, no traces of release grease (silicone) must remain
inside the hose(s). Any traces must be removed with a clean lintfree cloth.
　
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