April 6, 201511 yr I have searched in the forums but without success. I tried flying a tactical mission with the poseidon where I climbed to a cruise altitude, descended on the tactical area, flew around and would return. I wasn't able to get the plane to return to climb/cruise mode. Is there a procedure to reset the system so it will accept climbing again? Manfred G. Ships are cooler that you think.
April 6, 201511 yr Commercial Member Is there a procedure to reset the system so it will accept climbing again? Re-enter a cruise altitude on the CRUISE page. Start the climb in FL CH with the intended cruise alt (or initial cleared alt) in the alt window to get you into a climb. Once you re-enter a cruise altitude in the FMC, you should be able to switch back to VNAV. Kyle Rodgers
April 6, 201511 yr Author Yeah, I thought so too but when I entered a new cruise altitude it would jump back to the descent page... Manfred G. Ships are cooler that you think.
April 6, 201511 yr Commercial Member Yeah, I thought so too but when I entered a new cruise altitude it would jump back to the descent page... Even when you're climbing in FLCH with an altitude higher than your current? Kyle Rodgers
April 6, 201511 yr Author Yeah, that was the way I remembered it so I did it. I can try again soon and I'll report back Manfred G. Ships are cooler that you think.
April 6, 201511 yr Commercial Member Yeah, that was the way I remembered it so I did it. I can try again soon and I'll report back It may require you to climb in FLCH or V/S back to a cruise altitude such that you're at the altitude in the window in ALT HOLD before you can go back to re-set the cruise alt. I'm not looking at the manual right now. Kyle Rodgers
April 6, 201511 yr Author Hmm, when I retried this I totally broke the left FMC. I only accepted a single letter in the scratchpad and it didn't show me warnings. I did come to some rte finishes since I pretended to be on a patrol mission and I did stretch the FMC to it's capabilities. It feels as if I have come further than any beta tester so I will just give up here. This is more than a quick fix to solve. Manfred G. Ships are cooler that you think.
April 6, 201511 yr Commercial Member Hmm, when I retried this I totally broke the left FMC. I only accepted a single letter in the scratchpad and it didn't show me warnings. I did come to some rte finishes since I pretended to be on a patrol mission and I did stretch the FMC to it's capabilities. It feels as if I have come further than any beta tester so I will just give up here. This is more than a quick fix to solve. That's interesting. If you come across it again and have a set of steps to reproduce it, we'd be grateful. It would help us chase it down if it's an issue. Kyle Rodgers
December 6, 201510 yr Hi Kyle, Found this issue about 30 minutes ago. Currently flying KIAD - KLAX. Wanted to step climb, so I entered "34000" in the CRZ page since I was stepping up from FL320. Once I hit execute, the descent mode activated. I held off the decsent by hitting ALT HOLD. I manually flew up to 34000. When holding at FL340, tried entering the new altitude in the CRZ page and it just goes directly to the DES page again. Now, I'm also noticing single digits when trying to enter "any" information in the L FMC. I have to currently use to R FMC in order to enter information. I don't usually need to use step climbs in the NGX, so I can't say I've done it before. Here's how I was going to initiate the step climb: Enter FL340 in the CRZ page, reset MCP ALT to 34000 and hit FLCH. maybe I'm doing something wrong here? As of right now, I'm in ALT HOLD at FL340, with SPD Intervention armed at .79 Mach since VNAV wants to reduce power for decsent. Funny thing is CRZ is still showing on EICAS screen. Thanks for your time. Sante- Sante Sottile
December 6, 201510 yr Commercial Member Thanks for your time. Steps to reproduce? What was set on your PERF INIT page as the cruise altitude? Be as specific as possible so that I might be able to try and reproduce what you're seeing. Kyle Rodgers
December 6, 201510 yr Steps to reproduce? What was set on your PERF INIT page as the cruise altitude? Be as specific as possible so that I might be able to try and reproduce what you're seeing. Steps to reproduce would be to start the flight at KIAD with exact weight\fuel figures. Step climb would be roughly 30 minutes after departure up to FL340. Using the 737-900WL latest version. Also, If you have ASN, I have been using LIVE weather from Dec, 6th. 2015, in case you need to use historical. CRZ ALT was at 32000 in the PERF INIT Page. This information was provided to me by PFPX, exported directly to the NGX. (In case you'd like to reproduce). ******************************************************************************** F O R I N F O R M A T I O N O N L Y ******************************************************************************** UNITED AIRLINES FLIGHTPLAN - IFR UAL1073B N32404 KIAD-KLAX -------------------------------------------------------------------------------- ALL WEIGHTS IN POUNDS (LB) STD 06DEC/1850Z -------------------------------------------------------------------------------- OFP 1 - PREPARED 06DEC/2222Z BY SANTE SOTTILE 1073B/UAL1073B N32404/B737-9ERW CF ROUTE: (AUTO) DEP: KIAD/IAD 19R ELEV 313 FT MACH: M.81 TTL G/C DIST: 1986 NM ARR: KLAX/LAX 25R ELEV 128 FT INIT ALT: FL320 TTL F/P DIST: 2006 NM FUEL BIAS: 100.0% TTL AIR DIST: 2211 NM AVG WIND CMP: HD042 KT ALT: KLGB/LGB 30 ELEV 60 FT 27 NM -------------------------------------------------------------------------------- CONFIG DOW PAX CARGO TOTAL ULOAD LIM ZFW TOW LDW STANDARD 94600 153 7417 36429 2048 TOW MAX 136100 174700 157300 PLN 131029 172652 140999 ACT ...... ...... ...... FUEL CORR ENDUR TRIP 31653 ........ 04:51 CONT 5% 1583 ........ 00:19 ALTN KLGB 1026 ........ 00:08 FINAL RESV 2443 ........ 00:30 HOLD 2460 ........ 00:30 MIN T/O 39165 ........ 06:18 ..................................... EXTRA 2458 ........ 00:30 CAPTAINS SIGNATURE (....) TAXI 250 ........ 00:10 RELEASE 41873 ........ 06:58 I ACCEPT THIS OFP AND I AM FAMILIAR WITH THE PLANNED ROUTE AND AERODROMES FUEL TANK CAP 46057 LB / MAX EXTRA FUEL 2048 LB LIM BY TOW TRIP CORR FOR 3000 LB TOW INCR: +313 LB / 3000 LB TOW DECR: -466 LB 2000 FT LOWER: +900 LB / EET 04:47 CLB: 250/280/78 DES: 78/280/250 -------------------------------------------------------------------------------- KIAD STD 18:50Z/13:50L ETD 18:50Z ACT OFBL .... EST T/O 19:00Z ACT T/O .... KLAX STA 00:30Z/16:30L ETA 23:56Z ACT ONBL .... EST LDG 23:51Z ACT LDG .... 05:40 05:06 TTL BLCK .... TTL FLT .... -------------------------------------------------------------------------------- ATC ROUTE: N0474F320 BUNZZ3 RAMAY J149 EYTEE J6 COLNS J134 STL J110 RSK J64 TBC J128 PGS RIIVR2 Let me know what other information you'd like. I can't see what was in my PERF INIT now since it's still showing a descent profile. Thanks, Sante- Sante Sottile
December 6, 201510 yr Commercial Member Let me know what other information you'd like. I can't see what was in my PERF INIT now since it's still showing a descent profile. This is all well and good - the weights would help me get the plane into a similar weight state, and the route helps me get an idea of where you were going - but I need the button presses and procedure. Clearly, the airplane got into a state that was confused. I need to know how you get it into that state. Might you have set the cruise altitude too high - say FL360 - on the PERF INIT page such that when you were cruising at FL320, and wanted to change to FL340, 340 was actually a descent from 360...? Somehow the plane got into a situation where it saw 340 as a descent. That's what I need. See if you can get it to do it again, and then let us know what exact steps are required. Kyle Rodgers
December 6, 201510 yr This is all well and good - the weights would help me get the plane into a similar weight state, and the route helps me get an idea of where you were going - but I need the button presses and procedure. Clearly, the airplane got into a state that was confused. I need to know how you get it into that state. Might you have set the cruise altitude too high - say FL360 - on the PERF INIT page such that when you were cruising at FL320, and wanted to change to FL340, 340 was actually a descent from 360...? Somehow the plane got into a situation where it saw 340 as a descent. That's what I need. See if you can get it to do it again, and then let us know what exact steps are required. That makes sense! It could have been a much higher number in the PERF INIT page at the gate. I might have skipped over it by mistake and assumed PFPX was inputting that information automatically. I will re-visit the flight in the future and see if that was the culprit. Thanks for your time, Kyle. Sante Sottile
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