User manual

Table Of Contents
Part B Section
40 NOSE WHEEL SHIMMY
Nose wheel shimmy is hard on the nose wheel structuren and very damaging to the nose
wheel tyre.
The shimmy can be the result of mishandling during the run out,or through mechanical
problems in the shimmy damper or wheel balance. The correct action is to prevent It
occurring and to minimise its effect. After touch down use the following technique:
Nose Attitude Hold the nose wheel off the runway as long as possible
before placing It down before elevator control is lost.
Elevator Move positively forward to help dampen the wheel
shimmy
Brakes Apply as required to slow the aircraft without noticeable
strain.
Once through the shimmy speed relax the braking effect.
If shimmy persists establish the cause and eliminatie the problem before the next flight.
41 OVER HEATED BRAKES
Harsh braking will over-heat the brakes. This not only causes undue wear and tear on the
braking system but also poses the hazard of brake fire if they become too hot. Over
heated brakes will be apparent by smoke issuing from the discs, but more importantie the
Pilot will know how much braking was necessary and will know if the brakes will be hot.
Brake fire has been covered in Part 2,should It occur.
With brake overheating or fire:
Brakes
Speed
Park Brake
Coolant
Reduce use of brakes during taxying
Keep the airflow over the wheels by taxying.
Do Not Set. Use chocks.
Do not use cooling extinguishers such as water or CO2 on the
brakes. Allow them to cool by themselves, keeping watch for
further fire, and keep personnel away.
42 LANDING WITHOUT BRAKES
At 12700kg AUW, PBY can be landed safely using 65 Kts across the fence speed.
The aircraft is operating on the back of the drag curve and therefore needs considerabie
power to maintain the slow approach with less than the normal 300 fpm rate of descent.A
shallower approach path than normal is to be used, and floats may be used to increase
drag.
Use the runway which will provide the greatest into wind / landing distance combination.
Land up slope in nil or light wind conditions. Use the approach charts to determine the
shortest landing distance and compare this with distance available. If there is doubt then
proceed to another airfield where the distance available is adequate.
Stichting Catalina PH-PBY Rev No: 00
18 May, 2004 Page: 29