Random faliures

Bert · Post by **Bert** » Wed Aug 10, 2005 4:35 pm

"I have had my 2,3,4 engines freeze in cruise approximately 200 miles from destination. This random failure has happened on the same trip from Chicago to Amsterdam. Each time I have shut down the engines and restarted with no help. I have tried changing the position of the #2 master radio bus sw on and off with no effect. Each time I have had to land single engine (#1) only. I don't mind the practice but this is getting old. If anyone has a suggestion would appreciate your comments. [img]style_emoticons/<#EMO_DIR#>/wub.gif[/img] Thanks "

wijnand · Post by **wijnand** » Wed Aug 10, 2005 6:22 pm

"<div class='quotetop'>QUOTE(Bert @ Aug 10 2005, 09:35 PM)</div><div class='quotemain'>I have had my 2,3,4 engines freeze in cruise approximately 200 miles from destination. This random failure has happened on the same trip from Chicago to Amsterdam. Each time I have shut down the engines and restarted with no help. I have tried changing the position of the #2 master radio bus sw on and off with no effect. Each time I have had to land single engine (#1) only. I don't mind the practice but this is getting old. If anyone has a suggestion would appreciate your comments. [img]style_emoticons/<#EMO_DIR#>/wub.gif[/img] Thanks [right][snapback]4646[/snapback][/right] </div> Hello Bert, I don't know if this has anything to do with your engine problem, but I once accidentally pressed ""E"" , which key I assigned (until then) as the key to choose one engine. I got stuck, only throttle #1 would move, the others (#2,3, and 4) where off, no combination of ""E"" with key 1 thru 4 could bring them back. Since your troubles only concern no 2 - 4, I wonder if this has anything to do with it??? Good luck!"

globecar · Post by **globecar** » Wed Aug 10, 2005 10:36 pm

We have no 3 engine failures built-in. The fault comes from elsewhere.

Brogs · Post by **Brogs** » Thu Aug 11, 2005 6:47 am

"Hi I was en-route from Kuala Lumpur to Melbourne the other day and about 3000 ft below TOC when I started to lose Power,NI readings were normal as were the Throttle settings, MCP settings were correct , Rate of Climb was 2000 fpm and there was no problem with the Fuel, so I kicked it into manual at the point of Stalling and regained control after losing 10,000 ft in Height, once I had it under control again I got things back on track without any further problems, until 7hrs later on approach @ 3000ft ,the MCP went haywire and once again I had to kick it into Manual, go missed and go around to land it manually, another Brown Trouser moment! Now is this another sneaky built in Faliure similar to the Engine Fire I had in No3 about two months ago( and that alarm gave me a jolt I can tell you!) or was my system at Fault?,I have been having a couple of problems lately with my system but it would be nice to know , Safe landings, Mike"

globecar · Post by **globecar** » Thu Aug 11, 2005 8:46 am

"You did not give a lot of information but it would seem that 2,000 fpm when getting near TOC may be hoping for a little too much. We modeled the -7F engines which have less power than the ones below. ------------------------------------------------------------- When we were working on RFP we accumulated a lot of data from active 742 pilots who wrote down the numbers and the bits below were from NWA. Luckily NWA used the Penny and Giles gauges that saved the data to be recalled later. <span style='color:blue'>Tempature.95F/35C Takeoff gross weight?795,500 pounds flaps 20 RWY 22 We used ?Q? thrust EPR- 1.54 N1-99% N2-99% EGT-695C Fuel Flow- 23,0000 pounds per engine At 2000 feet AGL- with ?Q?CLB thrust1.30 N1-92% N2-92% EGT-620 Fuel flow-16,300 pounds per hour At 15,000 feet ?Q? CLB thrust IAS 340Kts TAS 1600 feet per minute EPR 1.40 N1 95% N2 97% EGT 575 FF 14,000 At 20,000 feet IAS 340 Knots/Mach .740 SAT/-19 TAS-439 .725 Mach 1500 Feet per minute climb EPR-1.45 N1-95% N2-97% EGT-580 FF-13, 000 AT 25,000 feet IAS 340/Mach .810 SAT/-27 1000 feet per minute climb EPR-1.50 N1-96% N2-97% EGT-580 FF 12,000 At 30,000 feet IAS 316 Knots/Mach .827 TAS 494 SAT/-39 800 feet per minute climb EPR-1.57 N1-96% N2 97% EGT-560 FF 10,000 Cruise altitude 31,000 feet .840 Mach TAS-499 SAT/-40 TAT/-07 weight 765,000 EPR-1.43 N1-92% N2-93% EGT-510 FF 8200 It took 30 mins to reach 31,000 feet.. At 35,000 feet weight of aircraft 670,000 pounds .840 Mach/IAS 288 TAS-485 SAT/-52 TAT/-21 CLB EPR shows 1.71 EPR-1.45 N1-92% N2-92% EGT-480 FF 7000 </span>"

Brogs · Post by **Brogs** » Thu Aug 11, 2005 2:53 pm

"Hi Ralph Mea Culpa ! having read those figures, talk about wishful thinking, just finished a Flight from EGLL-OMDB and kept the rate of climb to 1500, as I was Cruising at F290 I had no problems, thanks for the Info! Safe landings , Mike [img]style_emoticons/<#EMO_DIR#>/cool.gif[/img]"

globecar · Post by **globecar** » Thu Aug 11, 2005 3:30 pm

"Let me add the data from a different flight. Below is the copy of the information word for word. I took several snap shots for the development of the new EPR gauge. This data was from Tokyo. Conditions were +19 degrees Celsius and altimeter 30.16?, field elevation is about 200 feet. Engine at idle EPR-1.03 N1 - 30% N2 - 65% EGT-360 degrees Fuel Flow-1,700 pounds per hour Taxi (power pushed up just a bit EPR-1.05 N1-38% N2-70% EGT-400 N2-70% Fuel Flow-2000 pounds per hour Take off- we used ?J? derate which is the same as ?F? power 10 degrees flaps Flex temp was 38 degrees Weight was 764,000 pounds EPR for the flex take off was 1.44 N1-92% N2-95% EGT-550 degrees Fuel Flow-18,600 pounds per hour Performance at V2 + 10 = 2000 feet per min climb At 3000 AGL CLB thrust selected (flaps are still extended) EPR-1.31 N1-85% N2-92% EGT-500 Fuel Flow-13,000 pounds per hour Performance at V2 + 10 = 1000 feet per min climb After flaps retracted; Still CLB thrust 258 Knots Indicated airspeed, climb was 1500 feet per minute At 10,000 feet we select Full CLB thrust which is ?R? power KIAS-343 TAS-408 SAT-3 EPR- 1.46 N1-94% N2-95% EGT-520 Fuel Flow -15,000 pounds per hour Performance 2000 feet per minute 15,000 feet; -12 SAT +10 TAT TAS=426 KIAS=332 EPR-1.45 N1-94% N2-96% EGT-520 FF-12,500 Performance-1800 feet per min 20,000 feet -19 SAT +05TAT TAS=435 KIAS=332 EPR-1.48 N1-96% N2-97% EGT-510 FF-11,500 Performance-1200 feet per min 25,000 feet -32SAT -4TAT TAS-465 KIAS-332 EPR-1.53 N1-96% N2-97% EGT-470 FF-11,000 Performance-1000 feet per min 30,000 feet -42SAT -11TAT TAS=488 (MACH .825) KIAS=324 EPR-1.49 N1-96% N2-96% EGT-500 FF-10,000 pouds per hour Perf. = 800 feet per min CRUISE ALTITUDE = 33,000 -48SAT -16TAT TAS-493 (MACH .843) KIAS-301 EPR-1.45 N1-90% N2-92% EGT-470 FF-7,000 pounds per hour <span style='color:blue'>Information such as this was very important to us since FS9 does not support EPR. These gauges had to be scratch built and as many scenarios as possible built in. We tried as hard as possible to give something that was usable within what FS9 would allow.</span>"

Brogs · Post by **Brogs** » Fri Aug 12, 2005 8:37 am

"Hi Ralph Thanks for the Info, the Figures are very helpful, I,ve also found very informative the ITTV DVD of the Virgin Atlantic Classic 742-Fantastic! Safe Landings Mike"