First introduced on the series 200 in Feb 1979 as the Performance Data Computer System (PDCS), the Flight Management Computer (FMC) was a huge technological step forward. Smiths Industries (formerly Lear Seigler) has supplied all FMCs installed on the 737.
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The PDCS was developed jointly by Boeing and Lear Seigler in the late 1970's. It enabled EPR and ASI bugs to be set by the computer and advise on the optimum flight level, all for best fuel economy. It was trialed on two in-service aircraft, a Continental 727-200 and a Lufthansa 737-200 for nine months in 1978 with regular line crews and a flight data observer. The 737-200 showed average fuel savings of 2.95% with a 2 minute increase in trip time over an average 71 minute flight. The 727 gave a 3.94% fuel saving because of its longer sector lengths. The PDCS quickly became standard fit and many were also retrofitted. By 1982 the autothrottle had been devised and thrust levers could be automatically driven to the values specified by the PDCS.
The true FMC was introduced with the 737-300 in 1984 this kept the performance database and functions but also added a navigation database which interacts with the autopilot & flight director, autothrottle and IRSs. The integrated system is known as the Flight Management System (FMS) of which the FMC is just one component. Most aircraft have just one FMC, but there is an option to have two this is usually only taken by operators into MNPS airspace eg Oceanic areas. The FMS can be defined as being capable of four dimensional area navigation (latitude, longitude, altitude & time) while optimising performance to achieve the most economical flight possible.
The photograph above is of the Control Display Unit (CDU), which is the pilot interface to the FMC. There are normally 2 CDUs but only one FMC. Think of it as having two keyboards connected to the one PC. The CDU in the photograph has a DIR INTC key at the beginning of the second row but some have a MENU key. This key gives access to the subsystems such as FMC, ACARS, DFDMU, etc.
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In its most basic form, the FMC has a 96k word navigation database, where one word is two bytes (ie a 16 bit processor). This was increased to 192k words in 1988, 288k in 1990, 1 million in 1992 and is now at 4 Mega words for the 737-NG with Update 10.7. The navigation database is used to store route information which the autopilot will fly when in LNAV mode. When given data such as ZFW & MACTOW, it takes inputs from the fuel summation unit to give a gross weight and best speeds for climb, cruise, descent, holding, approach, driftdown etc. These speeds can all be flown directly by the autopilot & autothrottle in VNAV mode. It will also compute the aircrafts position based upon inputs from the IRSs, GPS and radio position updating.
The latest FMC – Model 2907C1, has a Motorola 68040 processor running at 60MHz (30Mhz bus clock speed), with 4Mb static RAM and 32Mb for program & database.
FMC Databases
An FMC has three databases: Software options (OP PROGRAM), Model/Engine data base (MEDB) and Navigation data base (NDB), all of which are stored on an EEPROM memory card. These databases can all be updated via the data loader.
The Software options database includes the operational program and its update, plus any company specific differences. For a full list of all FMC software updates and their features, please refer to the book.
The MEDB holds all the performance data for V speeds, min & max speeds in climb, cruise & descent, fuel consumptions, altitude capability etc.
The NDB is comprised of Permanent, Supplemental (SUPP) and Temporary (REF). The Permanent database cannot be modified by crew. There are four types of data: Waypoint, Navaid, Airport and Runway. Runway data is only held in the permanent database.
There is capacity in the SUPP and REF databases for up to40 waypoints, 40 navaids and 6 airports. SUPP data can only be entered on theground. It is then stored indefinitely but crew may delete individual data orthe whole database. Any existing SUPP data should be checked for accuracy beforeflight using the SUMMARY option (U6+ only) or DELeted and re-entered,cross-checking any Lat & Longs between both crew members. All Temporary(REF) data is automatically deleted after flight completion.
When entering navaids into either the REF NAV DATA or SUPPNAV DATA database, you will be box prompted for a four letter “CLASS”classification code. The following table should be used:
Eg. To create a new en-route VOR/DME, the Class code would be VDHW.
2. Enter any offset but do not execute. 3. Simultaneously press ERASE on both CDU's.
These steps will bring ALTERNATE DESTS. (See below)
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