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Nov 01/07
Printed in Germany
5. PREPARATION FOR INSPECTION
WARNING: OBEY STANDARD WARNINGS BEFORE WORKING ON, OR NEAR, THE HORIZONTAL
STABILIZER WHEN THE ELEVATOR IS ON THE A/C.
CAUTION: THE AMBIENT TEMPERATURE MUST BE KEPT TO WITHIN THE RANGE OF 10º C
(50º F) TO 30º C (86º F). IT IS RECOMMENDED TO PERFORM THE INSPECTION
INSIDE AN HANGAR. THERE MUST BE NO HOT OR COLD AIR FLOWS AROUND THE
INSPECTION AREA.
A. Make sure that the surface of elevator is clean and smooth.
B. Make sure that all hand holes of the front spar are covered.
C. Check all the inspection areas for visible damage, discontinuity, signs of
repairs or any condition which could affect the inspection.
NOTE: A visual inspection parallel to the elevator surface (upper and lower)
to compare the differences in surface reflection can help to detect
repairs or discontinuities.
D. Check and record the ambient temperature.
E. For METHOD A only (oven):
(1) Make sure that the Elevator is removed from the Horizontal Stabilizer
(Refer to AMM, Chapter 27-34-41, Page Block 401).
(2) Use a support tool to put the elevator in a vertical position, with
trailing edge down, so that the two panels are positioned at the same
angle to the floor (Refer to Figure 1004).
(3) Put the elevator inside the oven.
CAUTION: MAKE SURE THE THERMOCOUPLES HAVE GOOD CONTACT WITH THE ELEVATOR
PANEL.
(4) Fix 3 thermocouples to each elevator panel with adhesive tape such that
they are uniformly distributed and approximately in the middle of panel
areas (Refer to Figure 1005).
(5) Gradually heat the elevator in the oven. 4 of the 6 thermocouples must be
at 40º C (72º F) more than the ambient temperature in less than 10
minutes.
A318/A319/A320/A321
NONDESTRUCTIVE TESTING MANUAL
PART 10 - THERMOGRAPHIC
ALI NO. 55-20-07
Thermocouple Positions
(Thermal excitation METHOD A)
Figure 1005
EFFECTIVITY: A318,A319,A320,A321 55-20-07 Page 1011
Nov 01/07
Printed in Germany
A318/A319/A320/A321
NONDESTRUCTIVE TESTING MANUAL
PART 10 - THERMOGRAPHIC
ALI NO. 55-20-07
EFFECTIVITY: A318,A319,A320,A321 55-20-07 Page 1012
Nov 01/07
Printed in Germany
(6) Hold this temperature value stable (+2º C, 0º C / +3.6º F, 0º F) in the
elevator for at least 30 minutes. The total heating period should be 40
minutes minimum.
NOTE: Where thermocouple control is not possible, oven temperature, with
the elevator inside, shall be maintained at 40º C (72º F) above
ambient temperature for minimum 40 minutes.
(7) After heating, move the elevator out of the oven to a place away from
cold/hot airflows.
F. For METHOD B only (blankets):
(1) Make sure that the inspection is done away from cold/hot airflows.
CAUTION: DO NOT OVERLAP HEATING BLANKETS AND POSITION CAREFULLY TO PREVENT
DAMAGE THERMOCOUPLES, CONECTORS, ETC.
(2) Put the three blankets over the upper skin.
(3) Make marks to show the limits and reference number of each inspection area
on the elevator skin.(Refer to Figure 1002).
(4) Make sure there is good contact between the heating blankets and the skin.
CAUTION: DO NOT PLACE ANY MATERIAL OVER THE THERMOCOUPLE AREA OF THE BLANKETS.
(5) Hold the blankets with anti-slip clamps to hold the heating blankets in
place.
(6) Put insulation blankets on the blankets to be heated.
NOTE: It is mandatory to heat areas 2 and 3 at the same time. Areas 2 and
3 can be heated while area 1 is being inspected, or vice versa.
(Refer to Figure 1006).
(7) Do a check and record that ambient temperature is between 10ºC (50ºF) and
30ºC (86ºF).
(8) Ground the temperature controller to the elevator and refer to the
manufacturer instructions for operation.
A318/A319/A320/A321
NONDESTRUCTIVE TESTING MANUAL
PART 10 - THERMOGRAPHIC
ALI NO. 55-20-07
Preparation–Correct / Incorrect blanket supply
Figure 1006
EFFECTIVITY: A318,A319,A320,A321 55-20-07 Page 1013
Nov 01/07
Printed in Germany
A318/A319/A320/A321
NONDESTRUCTIVE TESTING MANUAL
PART 10 - THERMOGRAPHIC
ALI NO. 55-20-07
EFFECTIVITY: A318,A319,A320,A321 55-20-07 Page 1014
Nov 01/07
Printed in Germany
(7) Gradually heat the inspection area/s for a minimum of 32 minutes. Make
sure that the inspection area is 85 ‡3† C (185 ‡5.4† F) during a minimum of
the last 13 minutes of the heating period.
NOTE: Heating blankets of the kit have an average increasing temperature
slope of 4† C/min (7.2 †F/min) so you need between 14 and 19 minutes
　
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