Posts: 39
Joined: Mon Feb 18, 2002 8:38 pm

Fuel Nozzle In Cf680c2 Engs

Fri Nov 08, 2002 5:36 pm

there are 30 fuel nozzles around the cf680c2 engs combustion chamber
but the # 15 an # 16 nozzle different from other 28 fuel nozzle
as the manual said "no 15 and 16 will provide richer fuel during decent and part number also different "
the two nozzles install on bottom of the chamber about 6 o'clock position
why they different with others and why provide more fuel during decent?

Posts: 1319
Joined: Wed Jul 05, 2000 11:37 am

RE: Fuel Nozzle In Cf680c2 Engs

Sat Nov 09, 2002 10:56 am

The fuel nozzels at the number 15 and 16 positions are designed differently than the other 28 nozzles. They are also color coded differently than 26 other ones (The 2 which are attahced to the ignitors also have different p/n). Nozzles 15 & 16 have larger primary spray patterns. They are always going to provide more fuel. Fuel nozzles are designed to provide the most efficient spray patterns at high power settings. During descent when the throttles are at times idled and at much lower power settings, these nozzles with the extra fuel output provide flameout protection.

Most aircraft ignition/fuel systems do a little extra during the approach phases of flight to prevent flameouts at such a critical time (also during adverse weather). An example if high idle. When flaps are down, or mayeb gear down under certain altitudes on some aircraft - the engines will go into high idle. In some aircraft, ignition will be initiated with anti-ice on. All to prevent flameouts.
Posts: 518
Joined: Sun Feb 04, 2001 10:34 am

RE: Fuel Nozzle In Cf680c2 Engs

Sat Nov 09, 2002 12:30 pm

I think the -80A has an even stranger mix of nozzles.


Who is online

Users browsing this forum: 67ponajrad, ap305, cerealspiller and 1 guest

Popular Searches On Airliners.net

Top Photos of Last:   24 Hours  •  48 Hours  •  7 Days  •  30 Days  •  180 Days  •  365 Days  •  All Time

Military Aircraft Every type from fighters to helicopters from air forces around the globe

Classic Airliners Props and jets from the good old days

Flight Decks Views from inside the cockpit

Aircraft Cabins Passenger cabin shots showing seat arrangements as well as cargo aircraft interior

Cargo Aircraft Pictures of great freighter aircraft

Government Aircraft Aircraft flying government officials

Helicopters Our large helicopter section. Both military and civil versions

Blimps / Airships Everything from the Goodyear blimp to the Zeppelin

Night Photos Beautiful shots taken while the sun is below the horizon

Accidents Accident, incident and crash related photos

Air to Air Photos taken by airborne photographers of airborne aircraft

Special Paint Schemes Aircraft painted in beautiful and original liveries

Airport Overviews Airport overviews from the air or ground

Tails and Winglets Tail and Winglet closeups with beautiful airline logos