slickum17 Posted August 6, 2010 Share Posted August 6, 2010 What is the reasoning for putting flaps at 50% for engine runs on the ground? Quote Link to comment Share on other sites More sharing options...
tenten Posted August 6, 2010 Share Posted August 6, 2010 (edited) Hi, slickum17 If my memory is correct: The 50% is to relieve stresses imposed on the tail section of the airplane during the Engine Runs. I Read it somewhere, and I will try to find and post the reference. Edited August 6, 2010 by tenten Name correction Quote Link to comment Share on other sites More sharing options...
larry myers Posted August 6, 2010 Share Posted August 6, 2010 (edited) No surprise many procedures have changed since my day, 60s-70s. In those days, the engine run cklist. called for flaps up. If you were observed running engines with flaps in any position other than full up, you were, in most instances, hauled on the carpet. The concern was excessive heat on the 20 man life rafts. In any case seems to me the flaps are more fragile that the tail. Recall we had some mission profiles were we flew with 10% flaps. As a result, flaps were beat up enough to require depot level mx. usually at the next phase insp. Our sheet metal shop was outstanding, accomplishing this mx. without removing affected flaps from the wing. Edited August 6, 2010 by larry myers changed a word Quote Link to comment Share on other sites More sharing options...
tenten Posted August 6, 2010 Share Posted August 6, 2010 Yes, larry... In your days the “Run†was with flaps up. So… it is a matter of distributing the load, 30 years “hitting†tail, and… 30 years “hitting†flaps;……. fair and logic. Note: (we may use the correct word…… other than “hittingâ€â€¦.. “Casey is busy with the website†;) Quote Link to comment Share on other sites More sharing options...
tusker Posted August 8, 2010 Share Posted August 8, 2010 Yes Sir!!....in my time, we had the flaps up too........................in Trenton, Ont. Canada......................Cheers to you all guys!!..................John Boy Quote Link to comment Share on other sites More sharing options...
Herc 308 Posted August 8, 2010 Share Posted August 8, 2010 For The amount of time I have on the Herc(13yrs), we have always put the flaps down to 50% to keep the airflow off the tail which helps the plane from bouncing around when at high power(above 8000lbs of torque) which helps with stress on the tail and when carrying out prop balancing. Herc 308 Darrell Quote Link to comment Share on other sites More sharing options...
trev130eng Posted August 8, 2010 Share Posted August 8, 2010 Recommendation from a Lockheed Rep i asked this question to was to use 50% flap to reduce the stress on the tail at high power. Sure, it beats the hell out of your flaps but they can be re-skinned easily enough. Quote Link to comment Share on other sites More sharing options...
larry myers Posted August 8, 2010 Share Posted August 8, 2010 Yes, larry... In your days the “Run†was with flaps up. So… it is a matter of distributing the load, 30 years “hitting†tail, and… 30 years “hitting†flaps;……. fair and logic. Note: (we may use the correct word…… other than “hittingâ€â€¦.. “Casey is busy with the website†OK, ten I get it. So when do we go to 100% flaps?:) Quote Link to comment Share on other sites More sharing options...
Dave in WV Posted August 8, 2010 Share Posted August 8, 2010 OK, ten I get it. So when do we go to 100% flaps? Any time you want to climb over the chocks.:eek: ;) Quote Link to comment Share on other sites More sharing options...
tenten Posted August 8, 2010 Share Posted August 8, 2010 OK, ten I get it. So when do we go to 100% flaps? Well….., the 100% is beyond legal authority of bad guys. It is a self desired of the “Mighty Hercâ€. So, … “Keep an eye on the leverâ€. ;) Quote Link to comment Share on other sites More sharing options...
Skip Davenport Posted August 8, 2010 Share Posted August 8, 2010 Any time you want to climb over the chocks.:eek: Damn that's the worst traing I ever had to do was give you guys "jump chock" training it was like low level in extream turbulence! Quote Link to comment Share on other sites More sharing options...
Dave in WV Posted August 8, 2010 Share Posted August 8, 2010 Skip, I never saw it done but I'm a believer it would happen. Quote Link to comment Share on other sites More sharing options...
Muff Millen Posted August 8, 2010 Share Posted August 8, 2010 OK, ten I get it. So when do we go to 100% flaps? 100% if stuck in the mud and you shovel most of the mud from infront of the MLG tires. Muff Quote Link to comment Share on other sites More sharing options...
larry myers Posted August 9, 2010 Share Posted August 9, 2010 Damn that's the worst traing I ever had to do was give you guys "jump chock" training it was like low level in extream turbulence! Skip, If your talking about the 37th, am sure I was one of those knuckhead crew chiefs to whom you gave said training. Was well aware how happy you drivers were to provide such activity. At the time I thought it was good training, as many engine run troops had never experienced jumping chocks, how to avoid it, had no idea how fast it happened and how far the acft. would travel. Been there, done that. Hard on the blood pressure. First time running an A model, in the parking spot in front of the hanger, advanced thottles to crossover. Acft. jumped chocks heading for hanger doors. Darn good thing reverse worked. Must have been at least six hands on the throttles. By the time we got it stopped it was back on the spot. Come to find out when the dummy in the FM seat shut down the GTC he also shut down the ATM which in turn disabled the emergency brakes. One other time was running on a very slippery winter ramp and the acft. started to slide and simply pushed the chocks out. Deliberate throttle movement, keeping one eye outside, ramp fuel load, and adquate ramp in front of acft. keep me out of hot water, at least as far a eng. runup was concerned. Not talking about the rest. At Langley someone dreamed up a homemade steel runup chock. Was never a fan. Someone managed to get an acft. on top of this chock, ruining the tire and wheel and causing much uneeded excitment. On the other hand any faith the wooden chock was going to stop the excersion was badly misplaced. Was a big fan of continuing training and awareness. Unlike ops. there was no recurring checkride. When I got to Langley, spent about 20 mins. in the simulator, and magic,was engine run qualified. Quote Link to comment Share on other sites More sharing options...
tusker Posted August 9, 2010 Share Posted August 9, 2010 Flaps 50%................keps the guy in the right hand seat busy!!...................John Boy Quote Link to comment Share on other sites More sharing options...
Mcmuffin07 Posted August 9, 2010 Share Posted August 9, 2010 OK, ten I get it. So when do we go to 100% flaps? The only time we do it is in hot weather with a tail wind so the engine will actually start, otherwise its usually all the way up, or 50% during runs to relieve stress on the tail and to prevent all the bouncing. Quote Link to comment Share on other sites More sharing options...
yawdamper Posted August 9, 2010 Share Posted August 9, 2010 Wondering about the effect on the composite flaps. reskinning aluminum is one thing, composite repair is another. Any engine run induced flap maint. issues out there? Quote Link to comment Share on other sites More sharing options...
keepemflying130 Posted August 9, 2010 Share Posted August 9, 2010 Navair has flaps at full up, AF has them at 50 percent. Quote Link to comment Share on other sites More sharing options...
tusker Posted August 10, 2010 Share Posted August 10, 2010 ..............and I liked it when the machine was bouncing up and down during high power runs. The feeling was good and the thing wanted to escape on you!!......................... Do you recall the needles on the gauges, moving up and down. ........trying to get a good reading!!.....................John Boy Quote Link to comment Share on other sites More sharing options...
Herc 308 Posted August 18, 2010 Share Posted August 18, 2010 That is starting to change John Boy. We have 2 airframes now with a glass screen that has a digital needle gauge and a digital read out below it which is a really sweet set up. Darrell Quote Link to comment Share on other sites More sharing options...
tusker Posted September 2, 2010 Share Posted September 2, 2010 Let's push it to oblivian!!!!.....and let it bounce.............feels so good!!!!!!!!!!!!!!! Yes Sir!!!!!!!!!!.......................John Boy Quote Link to comment Share on other sites More sharing options...
Lkuest Posted September 2, 2010 Share Posted September 2, 2010 I've never had a problem jumping chalks with 100% flaps, but than again, I don't push all 4 up at the same time, either, only for troubleshooting. It makes the plane ride like a cadillac though. Quote Link to comment Share on other sites More sharing options...
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