11.3 Nacelles And Pylons Firewalls

Question 1

what must a firewall do ?

Answer 1

prevent any hazardous liquids, gas or flame from passing through the firewall

Question 2

what properties must a firewall hold IAW CS25.1191?

Answer 2

-fireproof
-no hazardous quuntities of gas, liquids or flame should pass through the firewall and effect other components of the aircraft
-each opening in the firewall or shroud should be sealed with close fitting, fireproof grommets, bushings or firewall fittings
-protected against corrosion

Question 3

when a firewall is present, what does this divide the engines into?

Answer 3

cooling zones

Question 4

what are firewalls made of ?

Answer 4

heat resistant materials such as stainless steel, inconel and titanium

Question 5

other than inside the engine, where else are firewalls located ?

Answer 5

nose cowl, hinged cowl panels, engine pylon

Question 6

how may a firewall be maintained ?

Answer 6

-visually inspect th firewall for condition, security and cracking
-pay close attention around the engine mount points, around holes where controls, plumbing and electrical cables pass through the firewall
-check condition of the grommets and sealents

Question 7

what are fire sheilds and heat blankets?

Answer 7

serve the same purpose as the firewalls

Question 8

how should a fire sheild and heat blanket be examined during maintence?

Answer 8

examined for cracks, tears and burned areas. worn or damaged parts should be replaced