Back to home page737NG CDS BP15

Home > Flight Instruments > CDS BP15


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


The 737NG Common Display System has had several software updates to incorporate additional features, improvements to existing features and bug fixes. Each new update is known as a Block Point, they have been as follows: BP98, 99, 02, 04, 06 and finally 15. Here is the list of features available in BP15:

BP 15, Oct 2016, L/N 6119 onwards and earlier aircraft by retrofit

  • Classic EFIS formats deleted.
  • Moved ILS fail flag location on PFD to the end of the NPS.
  • Deletion of engine download limits no longer cause the nuisance red oil temperature and pressure vertical scales.
  • Nuisance CDS MAINT or DSPLY SOURCE messages causing DEU removals addressed.
  • The OAT data from the engine probes is passed from the EECs through the CDS to the FMC. (see incident to C-FWGH for the significance of this)
  • DUDB maintains compatibility with NW Phase 3A DUs.
  • The CWS Roll and Pitch annunciation boxes will now blink for 10 seconds when CWS mode engages to improve pilot awareness.
  • The CDS logic for the NPS has been improved to not interfere with the display of the lateral ILS dev scale when manoeuvring to align with the localizer.
  • Fuel Imbalance Alert can now be displayed when the airplane is on the ground (helps for refuelling!).
  • Revised CDS logic to avoid sending data to the FDR that contains a false indication that a distance to runway threshold is displayed on the PFD when no distance is actually displayed.
  • Updated the CDS fault logic to avoid uncommanded WXR turn-on that can occur when the DEU is on and the EFIS CP is detected off.
  • In-flight Start Envelope updated (FL270 to FL240) for CFM56-7BE SAC engines.
  • Enhanced DSPLY SOURCE dispatch indications on the PFD to DSPLY SOURCE 1 (2).
  • Added a DU Overheat fault message to the CDS BITE.
  • Weather Radar test mode fault message colour changed from cyan to amber.
  • “MAN SPD” displayed in small white letters will be displayed below and to the right of the airspeed tape when speed reference set to the SET knob position.
  • Fixed Incompatibility between DEU-I and FMC U12.
  • Revised the On-Ground logic for the Airspeed Filter. To ensure that a PSEU fault does not inadvertently indicate an erroneous in-air state to the PFD airspeed filter and affect airspeed filtering during takeoff roll.
  • Updated CDS to implement stroked ND indications to enhance the existing RAAS feature consisting of additional visual data that includes SHORT RUNWAY and ON TAXIWAY annunciations.
  • Optional RSAT: Overrun Warnings; Speedbrake Warnings; Perspective Runway on Heads-up Display.
  • Optional RCAS: Autopilot Roll Saturation Alerts; Roll/Yaw Symmetry; Roll Authority; Enhanced Bank Angle Warning.

See more details about the book

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 ***

The 737 Tech Site on Facebook The 737 Tech Site on Twitter The 737 Tech Site on Instagram The 737 Tech Site on Instagram

Footer block