Standard fit in an NG is the same as the -300: Two Control and Display Units (CDUs) feeding ONE Flight Management Computer (FMC), however dual FMCs are an option, as are Alternate Navigation Control and Display Units (ANCDUs)
ANCDUs are a CDU with the addition of a basic area navigation (i.e. LNAV, but no VNAV) computer installed. You will know if you have this option as you will have and Alternate Navigation Switch (ANS, with positions L and R) on the glareshield to direct the correct nav inputs to the autopilot.
If you don't have ANCDU backup:
Take-Off & Climb
- Navigation is not normally permitted in B-RNAV (RNP 5) airspace, however is it normally OK to proceed to a repair airport with ATC informed. (Jeppesen Text, ATC pages 551-554)
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- MEL 2-34-27 is applied, some MNPS airspace routes must be avoided.
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- The Repetitive Flight Plan (RPL) must be cancelled, and a new plan filed with "S & R" in item 10 removed. "STS/NONRNAV" must be entered in item 18.
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- The phrase "Negative RNAV" is appended to each radio message on initial contact with each ATC frequency change.
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- Obtain the take-off N1 from the QRH "TAKEOFF N1%" page (it used to be PI 10.11), or the "ASSUMED TEMPERATURE REDUCED THRUST" PAGE (PI 10.12-13)
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- Set the calculated take-off N1 on the PF's N1 bug, using the manual bug procedure.
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- Calculate the MCT thrust (QRH PI 13.2) and set that on the PNF's N1 bug using the manual procedure (in case of engine failure)
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- MCP settings are normal (except no LNAV or VNAV), set the EHSI to VOR/ILS rose or expanded, as appropriate for navigation.
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- AUTOTHROTTLE is not available for take-off - set thrust manually prior to 80 knots.
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- Climb power may be set by selecting the AUTOTHROTTLE selector to ARM, and pressing the N1 button. (at thrust reduction altitude.)
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- Pitch modes available for flight are: TO/GA, LVL CHG and V/S (no VNAV)
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- You will need to navigate by HDG and/or VOR/LOC.
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- Once established on outbound track and above FL150 disengage the AUTOTHROTTLE (or deselct N1) and periodically set the N1 climb limit on both N1 guages as per QRH MAXIMUM CLIMB % N1 (PI 10.14) every 4-5000 feet.
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(As the Power Management Computers (PMCs) are using inlet temperature and pressure data (Pı,Tı sensed from the probe in front of the engine's fan) they have a very conservative schedule, so a significant performance degredation occurs as the aircraft climbs. There is no climb performance table information from the FMC, so the AUTOTHROTTLE will attempt to maintain the lower thrust if used in the climb)
Cruise
- Approaching cruise level, extract the target N1 from (QRH PI 10.15 FLIGHT WITH UNRELIABLE AIRSPEED/TURBULENT AIR PENETRATION (Cruise), and set this number on the PNFs N1 guage.
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- Reaching cruise level, extract Limit N1 from the QRH MAXIMUM % CLIMB page, and set on the PF's N1 guage.
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- Autothrottle can be used to maintain cruise speed. Company rules vary, but generally without ECON cruise, LRC cruise is used (it could of course be a fixed MN cruise).
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- Navigate Raw data (or radar vectors if you have no shame about not being competent enough to fly an aircraft
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Descent - Approach
- Calculate your descent point from the chart M0.74/250 KTS DESCENT SPEED (ALL ENGINES) (PI 11.5)
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- Prior to commencing descent, bug the Vref speeds, using the VREF chart (QRH 10.3)
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- Once the ATIS is received, set the N1 guage cursors to cover a missed approach or Go-Around from the QRH GO-AROUND % N1 chart (page PI 10.14)
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- Descend at your company speeds - M0.74/280/250, for example.
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- Use Raw data below MSA, ensure the EHSI mode selector is at VOR/ILS
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- Auto-throttle may be used throughout the descent and approach.
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- In the event of a missed approach, pressing the TO/GA buttons will cause the AUTOTHROTTLE to disengage, and the thrust levers will have to be manually advanced to the previously buggeed N1 limit. The flight director will correctly display TO/GA commands.
N.B. : experience shows that FMC failures are usually of relatively short duration, if operating in ANCDU with IRS pages displayed on the CDU there will be no indication of FMC reset. Press any of the top two rows of keys on the CDU (INIT/REF, RTE, CLB etc) to test FMC status