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Aircraft Technical Manual
JTM001-5
Trouble Shooting – Vertical Speed Indicator
11.5.10
Table 11-4 – Trouble Shooting – Vertical Speed Indicator
Trouble
Instrument fails to
operate
Incorrect indication
Pointer oscillates
Hand vibrates

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ISSUE 1 2 3
Jabiru Aircraft
J120, J160, J170, J200/J400, J230/J430, J250/J450 Variants
Probable Cause
Static line plugged
Static line broken
Partially plugged static line
Ruptured diaphragm
Pointer off zero
Partially plugged static line
Leak in static line
Leak in instrument case
Excessive vibration
Defective diaphragm
4 5 Dated: 29th October 2014
Pty Ltd
Remedy
Check line for obstructions. Blow
out lines.
Check line for damage,
connections for security. Repair
or replace damaged line, tighten
connections.
Check line for obstructions. Blow
out lines
Substitute known-good indicator
and check reading. Replace
instrument
Reset pointer to zero
Check line for obstructions. Blow
out lines
Test lines and connections for
leaks. Repair or replace
damaged lines, tighten
connections.
Substitute known-good indicator
and check reading. Replace
instrument.
Check shock mounts. Replace
defective shock mounts.
Substitute known-good indicator
and check for vibration. Replace
instrument.
Issued By: AS Page: 255 of 298