User manual

Table Of Contents
Part B Section 12.32
12.32 LANDING GEAR AND BRAKES
01 GENERAL
The Catalina PBY 5a is fitted with a tricycle landing gear
For detail of the landing gear and brake structure see the Aircraft Technical Manual.
02 LANDING GEAR CONTROL
A control handle located on the lower part of the Instrument Panel operates the Landing
Gear. It is left of centre and can be operated by either of the two Pilots though to do so is
difficult for the First Officer. It is most important that the lever be operated in one complete
movement without pausing between the 'UP' and 'DOWN' positions.
Such a pause may cause a build up of backpressure in the hydraulic system activating the
sequence valves out of their normal order. A re- cycling of the gear will be required.
CAUTION: Maximum Landing Gear Operation Speed is 122 kts
Before every landing the Gear has to be visually checked for security in the 'DOWN'
position. A crewmember is to be delegated to carry out this function and he/she must have
been trained in the procedure. Positive confirmation of 'Gear Down' is to be obtained
before landing.
WARNING: Correct and safe operation of the landing gear requires the
Following:
1) Smooth, complete movement of the gear selection handle.
2) Correct hydraulic pressure before, during and after gear operation.
3) Audible 'SNAP' of the gear into place.
4) Visual confirmation by a trained crewmember that the gear is safely 'DOWN and
LOCKED'.
03 BRAKES
Each pilot has a set of brake pedals, which are interlined. Only one set of pedals can be
used at a time and pilots cannot help each other to
Apply more brake pressure.
Pressure to activate the brakes is obtained from the main hydraulic system with a
minimum of 600 psi necessary to obtain full brake pressure.
Goodyear multiple disc brakes are operated by via cables to the brake valve located to the
right of the co-pilot on the hull.
A 10-inch accumulator (reservoir) is charged by air to 600 +/- 25 psi through its air
connection. The accumulator is located in the Bow together with the Brake Accumulator
Air Pressure Gauge and the Brake Accumulator Hydraulic Pressure Gauge. Hydraulic
pressure further pressurizes the accumulator to 800-1000 psi normal operating pressure,
with a pressure relief valve operating at 1250 psi.
Stichting Catalina PH-PBY Rev No: 00
18 May, 2004 Page: 1