Maintenance Manual STEMME S10
Date of Issue: Oct. 01, 1990 page: 41
Amendment No.: - Date: -
A4010021_B19.doc
Doc.No.: A40-10-021
7.4.2 Tail Wheel
After removal of the wheel fork: Do not grease the upper bearing. Friction is intended in order to prevent tail
wheel flutter.
For tire replacement, watch out for the slip mark. The tyre wears down within a relatively short time, since
during manoeuvring on the ground, the high inertia moment of the wing span of 75.5 ft. (23 m) counteracts
the steering force.
7.5 Flight Instruments and Static Pressure System
Maintenance of the flight instruments in accordance with the instructions given by the manufacturer
concerned (see Equipment List).
Calibration of the Stall Warning System:
Functional check on the ground:
shunt the pneumatic push button, which releases the stall warning at approximately 33 kts (60 km/h, connect
the device to + 12 V on the main bus). Turn the adjustment screw on the panel (placarded with "stall
warning") until the acoustic warning is actuated.
In-flight calibration: Fly with a center of gravity position in the rear range with a total mass of 1874 lbs.
(850 kg).
Configuration for the calibration:
Wing flap position L, landing gear and air brakes retracted, engine running at 3000 rpm, horizontal flight, not
above 3300 ft. (1000 m) MSL. Fly at a speed of 45 kts (83 km/h). Turn adjustment screw until the acoustic
warning is actuated. Recheck several times.
Second check item:
Wing flap position 0°, the warning must operate at 47 ± 1.5 kts (87 ± 3 km/h).
Maintenance of the Static Pressure System: (see fig. 3.5.a)
Inspect and clean the pressure ports: bar probe on the propeller dome, the opening for the stall warning
positioned below and two openings in the tail boom (to the left and to the right) 8.83 ft. (2.69 m) rear of the
wing leading edge.
Flexible hoses and fine filter plugs are to be replaced in case of contamination, embrittlement or cracks. If
moisture has accumulated in the flexible hoses, they are to be removed and can be reused after they have
been dried completely.
7.6 Electrical System
Regulator voltage: maximum of 14.7 V
Voltage drop of a charged battery as new at approximately 15° C during starter operation: 2 V.
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