|A fire fighting kit has been installed in aircraft Registration
Number EC-GQN (Serial # 290, this aircraft was ordered by and used by the
Spanish Air Force , tail #T.9-12) . The FAA has approved both the kit and
the installation with STC number ST01930 AT. This aircraft was up for sale
on October 1999 by the Indra-BDE of Spain and it's status is unknown at
The Kit has been designed following the US Department
of Agriculture requirements. The water tank, with a total capacity of 3,500
lt., is divided into two independent compartments. These compartments are
discharged through 6 doors at each side of the fuselage. The doors are
gravity opened and hydraulically closed. The hydraulic system of the water
tank is connected to the hydraulic system of the aircraft, employing security
cut-off valves to isolate it in case of leaking or malfunction.
An electrical system exists to control the water discharge,
the doors closure and the isolation of the water tank hydraulic system
if any failure appears. Additionally, there is a hand operated hydraulic
cut-off system in the cockpit just besides the pilot's seat.
There is an emergency system to discharge the water to
be used in case of normal function failure. The emergency system is operated
with a lever in the cockpit, just besides the co-pilot's seat. The kit
is installed inside the aircraft and fixed to the cargo bay floor with
screws. The installation is simple and does not interfere with the rest
of the aircraft systems. Likewise, the kit can be
removed very easily, so the aircraft can be used for fire fighting or cargo
tasks. Once the kit is removed, the aircraft recovers all the cargo capabilities,
without any reduction in weight or in volume. The aircraft needs to be
modified to install the kit. The modification consists of the opening of
doors in the fuselage to install the discharge pipes and the installation
of the structural reinforces to recover the original aircraft characteristics.
The aircraft modified for fire fighting has no restrictions
in its basic performances due to the installation of the kit.