Joint Aviation Requirements jar–25 Large Aeroplanes

Each fuel system must allow the supply of fuel

to the APU –

(a) through a system independent of each

part of the system supplying fuel to the main

engines, or

(b) by any other acceptable method. (See

ACJ 25A953(b).)

1. 
   Посредством система, независима от всяка част на система, подаваща гориво към основен двигател, или
   

2. 
   Посредством някакъв друг приемлив метод.
   

(a) Each fuel line must be installed and

supported to prevent excessive vibration and to

withstand loads due to fuel pressure and

accelerated flight conditions.

(b) Each fuel line connected to components

of the aeroplane between which relative motion

could exist must have provisions for flexibility.

(c) Each flexible connection in fuel lines that

may be under pressure and subject to axial

loading must use flexible hose assemblies or

equivalent means.

(d) Flexible hose must be approved or must

be shown to be suitable for the particular

application.

(e) No flexible hose that might be adversely

affected by exposure to high temperatures may be

used where excessive temperatures will exist

during operation or after an APU shutdown.

(f) Each fuel line within the fuselage must be

designed and installed to allow a reasonable

degree of deformation and stretching without

leakage.

Fuel system components in an APU

compartment or in the fuselage must be located or

protected from damage which could cause the

release of dangerous quantities of fuel as a result

of a wheels-up landing.

In addition to the requirements of JAR

25A1189 for shut-off means, each fuel valve must –

(b) Be supported so that no loads resulting

from their operation or from accelerated flight

conditions are transmitted to the lines attached to

the valve.

1. 
   Не се отнася за JAR-25.
   

2. 
   Да е закрепен така, че да не може да предава натоварвания, причинени от неговата работа или от условията на ускоренията в полет, към тръбопроводите, свързани към този клапан.
   

(a) Drainage of the fuel system must be

accomplished by the use of fuel strainer and fuel

tank sump drains.

(b) Each drain required by sub-paragraph (a)

of this paragraph must –

(1) Discharge clear of all parts of the

aeroplane;

(2) Have manual or automatic means

for positive locking in the closed position; and

(3) Have a drain valve –

(i) That is readily accessible and

which can be easily opened and closed;

and

protected to prevent fuel spillage in

dangerous quantities in the event of a

landing with landing gear retracted.

1. 
   Дренирането на горивната система трябва да се извършва посредством използването на дренажи на горивни цедки и утайници на горивни резервоари.
   

2. 
   Всеки дренаж, изискван от подпараграф (а) на този параграф трябва –
   

1. 
   Да изхвърля дренираното гориво надалеч от всякакви части на самолета.
   

2. 
   Да има ръчни или автоматични средства за надеждното му фиксиране в затворено положение, и
   

3. 
   Да има дренажен клапан -
   

1. 
   Който е лесно достъпен и който може да бъде лесно отворен и затворен, и
   

2. 
   Който е или разположен така или защитен по начин, предотвратяващ разливането на гориво в опасни количества в случай на кацане с прибран колесник на самолета.
   

(a) Each APU must have an independent oil

system that can supply it with an appropriate

quantity of oil at a temperature not above that safe

for continuous operation. The oil system for the

APU must comply with JAR–APU even if the oil

system is not an integral part of the APU.