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Illustrated technical information covering Vol 2 Over 800 multi-choice systems questions Close up photos of internal and external components Illustrated history and description of all variants of 737 Databases and reports of all the major 737 accidents & incidents History and Development of the Boeing 737 - MAX General flightdeck views of each generation of 737's Technical presentations of 737 systems by Chris Brady Detailed tech specs of every series of 737 A collection of my favourite photographs that I have taken of or from the 737 Press reports of orders and deliveries Details about 737 production methods A compilation of links to other sites with useful 737 content Study notes and technical information A compilation of links to major 737 news stories with a downloadable archive A quick concise overview of the pages on this site



FMC Update 12 came just 9 months after Update 11 in December 2015. It will be replaced by Update 13 which is being developed for the 737 MAX and later by U14.

A list of features is given below.


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All of the information, photographs & schematics from this website and much more is now available in a 374 page printed book or in electronic format.

*** Updated 23 Nov 2020 ***

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Update 12.0

    1. Data such as high precision position and runway condition from Approach Ref 2/2 is made available for Runway Situational Awareness Tools (RSAT) system although it is not yet certified.
    2. Improvement that delays capture of IAN Final Approach Course for certain geometries.
    3. The pilot can now define Visual Flight Rules final approach utilizing the IAN function. The pilot selects the runway and FPA as normal.
    4. The vertical angle of the glide path IAN function will continue to obey any altitude constraints from the Final Approach Fix to the coded MAP waypoint (Vertical Reference Point).
    5. Changed the sign of the XTK IAN lateral deviation when the track angle error is greater than 90 deg. To harmonise NPS display with ILS.
    6. Adds a comparison of an OAT entry made by the pilot with available OAT information provided from the EEC (NG) or TAT (Classics). If a difference is detected the FMC alert message “OAT DISAGREE -DELETED” and TAKEOFF SPEEDS DELETED will be displayed.
    7. DATALINK LOST alert message displayed if FANS datalink connectivity is lost.
    8. During a VNAV PTH descent the A/T can now be configured to “wake up” from ARM to FMC SPD when the speed drops to between 5-15kts below target speed. (It used to be 15kts below).
    9. RTA improved by recalculating with every flight plan change.
    10. Various other bugfixes.

Note that U12 has the following two in-service issues.

  1. Flickering CDS MAP displays or Fuel Quantity indication - fixed with CDS BP15
  2. The FMC can load an incorrect EO SID on the RTE LEGs page creating a MOD flight plan. - to be fixed with U14
  3. IAN aircraft - nuisance G/S Alerts resulting from the IAN path being steeper than VNAV - to be fixed with U13
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