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Verfügbare Sprachen
INSTALLATION INSTRUCTIONS
Installation:
The mounting dimensions of the vane-type variometers types 5 StV and 5 StVL correspond to the
so-called large standard. The diameter of the hole in the instrument panel is 80 mm, the hole circle
diameter on the mounting flange is 89 mm. The mounting dimensions of the van-type variometers
types 5 StVM and 5 StVLM correspond to the so-called small standard. The diameter of the hole in
the instrument panel is 57 mm, the hole circle diameter on the mounting flange is 66,7 mm. M 4
countersunk screws are used for fastening. The instrument panel should be flat and fixing holes
should be accurately located for stress-free mounting of the instrument. The instrument panel
should be well sprung.
Connection:
The variometer must be connected to the static pressure and an expansion tank. The volume of the
expansion tank must correspond to the volume for which the instrument was calibrated. Static
pressure is tapped either from the second connection of the pitot tube or by static pressure
sensors attached to the fuselage side. The pressure tapping point should be selected so that no
errors are produced from air flow around the aircraft fuselage.
If fitted in a glider, it is recommended that the variometer is connected to a low pressure nozzle with
a coefficient of - 1, rather than to the static pressure (total energy compensation).
Hose leads should be as short as possible and must not be twisted or contain sharp bends.
Kinking of hoses should be avoided in all cases. Hoses and connections must be absolutely leak-
tight. The instruments must protected from water penetration. If the hoses from the pressure
tapping points cannot be run upwards, a water trap (water bag) should be fitted at the lowest point.
Testing for leak-tightness:
Before putting into service, a test must be carried out for leak-tightness. If the aircraft manufacturer
has not given any special instructions for this, our standard instruction for leak-tightness testing,
January 1978 edition, can be used.
MAINTENANCE INSTRCTIONS
Leak testing should be carried out at least once a year. Otherwise, the instrument does not require
any maintenance.
RETESTING AND REPAIR
The service condition and accuracy of measurement of instruments is normally retained over a
long period. Should retesting or repair be necessary, the instrument should be sent to the
manufacturer or a suitable aircraft engineering-company. It should be packed to protect it from
impacts and connections should be sealed. Under no circumstances should you interfere with the
measuring mechanism of the variometer.
We recommend that variometers are retested after 5 years.
ACCOMPANYING DOCUMENTS
New instrument:
1 ) Test certificate EASA Form One, POE
2 ) Installation and maintenance instructions.
Used instrument:
1 ) Test certificate EASA Form One, POE
ATTENTION
This issue replace all previous editions.
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