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FROM THE PITOT PROBES, INCORRECT AIRSPEED-SENSING AND ALTITUDESENSING
SIGNALS CAN OCCUR. THIS CAN CAUSE DANGEROUS FLIGHT
CONDITIONS.
(2) At the two pitot probes on the vertical fin, do the following:
(a) Seal the drain hole on each pitot probe.
CAUTION: MAKE SURE THAT THE PITOT PROBE HAS NO ADDED WEIGHT ON IT FROM THE
TEST HOSE. THE WEIGHT OF THE TEST HOSE CAN BEND OR TWIST THE PITOT
PROBE OUT OF TOLERANCE.
(b) Connect the pressure lines from the air data model test set, COM-1914 or regulator,
SPL-1742 or equivalent to the two pitot probes.
SUBTASK 27-31-17-020-001
(3) Inside the aft unpressurized compartment, below the elevator feel computer, do the following:
(a) Remove the restrictor valves from the bottom of the pitot lines Figure 201.
(b) If you are using the regulator, SPL-1742, or equivalent, for the leak test, do the following:
NOTE: The DPS 400 Test Set can be used as an alternate tool to the DPS 500.
1) Connect the pressure gage lines from the regulator, SPL-1742, or equivalent, to the
drain holes of the pitot lines.
(c) If you are using the air data model test set, COM-1914 for the leak test, do the following:
1) Install plugs over the ends of the pitot lines.
2) Install a highly visible streamer on the opening of the aft unpressurized compartment.
a) Make sure that you can easily see the streamer from the ground.
NOTE: This is to remind you to remove the plugs and install the restrictor valves
again when the test is completed.
SUBTASK 27-31-17-790-002
(4) Do the pitot system leak test:
NOTE: The pitot drain lines must be sealed in order to hold pressure during the test.
CAUTION: DO NOT INCREASE THE PRESSURE TO MORE THAN 6 PSIG (474 KCAS/41.4 KPA)
DURING THE TEST. IF THE PRESSURE IS MORE THAN 6 PSIG (474 KCAS/41.4
KPA), IT CAN CAUSE DAMAGE TO THE ELEVATOR FEEL COMPUTER.
(a) Operate the air data model test set, COM-1914 or regulator, SPL-1742 or equivalent, to
apply pressure between 194 kcas and 201 kcas (or 2.50 +0.05 / -0.00 psig (17.25 +0.35 / -
0.00 kPa)).
(b) Set the shutoff valve in the air data model test set, COM-1914 or regulator, SPL-1742 or
equivalent to the OFF position.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
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(c) Make sure that the pressure does not decrease more than 0.2 psig (8 kcas/1.4 kPa) during
a 2-minute time.
NOTE: The low pressure pressurization steps above ensure that there is no significant
system leak before you apply full pressure in the following steps. If there is a leak
in the pitot system or the pressurization equipment, you can exceed the full
pressure of 6 psig and cause damage to the feel computer bellows.
1) Fix any pitot system or pressurization equipment leaks, as necessary.
(d) Operate the air data model test set, COM-1914 or regulator, SPL-1742 or equivalent, to
apply pressure between 387 kcas and 403 kcas (or 5.0 ±0.1 psig (34.5 ±0.7 kPa)).
(e) Set the shutoff valve in the air data model test set, COM-1914 or regulator, SPL-1742 or
equivalent to the OFF position.
(f) Make sure that the pressure does not decrease more than 0.3 psig (12 kcas/2.1 kPa) during
a 2-minute time.
(g) Operate the air data model test set, COM-1914 or regulator, SPL-1742 or equivalent, to
decrease the pitot pressure to zero.
SUBTASK 27-31-17-160-001
(5) At the two pitot probes on the vertical fin, do the following:
(a) Remove the pressure lines from the air data model test set, COM-1914 or regulator,
SPL-1742 or equivalent to the pitot probes.
(b) Remove the seals from the drain holes in each pitot probe.
SUBTASK 27-31-17-080-001
(6) Inside the aft unpressurized compartment, below the elevator feel computer, do the following:
(a) If you used the regulator, SPL-1742, or equivalent, for the leak test, do the following:
1) Disconnect the pressure gage lines of the regulator, SPL-1742, or equivalent, from the
drain holes of the pitot lines.
(b) If you used the air data model test set, COM-1914 for the leak test, do the following:
1) Remove the plugs that were installed over the ends of the pitot lines.
2) Remove the highly visible streamer on the opening of the aft unpressurized
compartment.
(c) Install the restrictor valves on the bottom of the pitot lines.
SUBTASK 27-31-17-410-005
(7) Close this access panel:
Number Name/Location
311BL Stabilizer Trim Access Door
------------------------- END OF TASK ---------------------------
TASK 27-31-17-780-801
6. Elevator Pitot System - Pressurization
(Figure 201)
　
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