Airplane Maintenance Manual
Bristell
B23-915
Chapter 71
supplement
Chapter 71 Page 2
Issue: 09.12.2021
71-10
Cowling
Engine cowling (Fig. 1) consists of two parts: upper cowling and lower
cowling. The upper cowling (1) is attached by means of quick fasteners
- Camlocks (6) to the firewall and to the lower cowling (2). Unlock the
quick fasteners by turning the bolt by 90° counter
–
clockwise. The oil
access cover (7) which is located on the upper cowling on the left side
in front of the firewall enables to check oil quantity in the oil tank
without removing the upper cowling and without the use of tools. The
coolant access cover (8) is mirrored on the RHS for preflight check of
coolant level in the overflow bottle.
The lower cowling (2) is attached by means of quick fasteners to the
firewall and to the upper cowling (1). The front part of the lower cowling
features two large openings for: oil radiator (3) and front water cooler
(4). Behind these openings a smaller hole supplies the heating system
with air (5). A large NACA scoop (9) on top of the upper cowling is the
air inlet for the intercooler and the rear water cooler.
Two smaller NACA
scoops supply a constant airflow into the engine compartment. The
outlet consists of a large opening on the lower cowling next to the
firewall (12). By means of a “suction lip” a pressure gradient is created,
increasing the airflow through the engine compartment.
Fig. 1
Engine Cowling
