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B767 captain reported that on numerous occasions; departing runway 27L at egll on the cpt 3G departure; that just before the blue intercept circle for the lon 257 deg. Radial inbound to D257G the blue intercept circle goes away and the D257G waypoint becomes white. It is necessary to close the discontinuity and reengage LNAV.
| Attributes | |
| ACN | 1403588 |
| Time | |
| Date | 201611 |
| Place | |
| Locale Reference | EGLL.Airport |
| State Reference | FO |
| Environment | |
| Flight Conditions | IMC |
| Aircraft 1 | |
| Make Model Name | B767 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Takeoff |
| Route In Use | SID CPT3G |
| Flight Plan | IFR |
| Person 1 | |
| Function | Captain |
| Experience | Flight Crew Total 7790 Flight Crew Type 5006 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Track / Heading All Types |
Narrative:
Egll cpt 3G departure. This is my 6th report filed on this anomaly in the past 2 years. Our 767s have an issue with the CPT3G departure off of runway 27L at egll. Somewhere around 1500' just before the blue intercept circle for the lon 257 deg. Radial inbound to N5127.5 W00038.8 (D257G in the FMC) the blue intercept circle goes away and the D257G waypoint becomes white (was magenta). The FMC issues a message 'not on intercept heading' because the intercept circle has gone away. I have noticed this anomaly for over 15 years off of 27L in our 767-300s.again; it is my opinion that the company should issue a bulletin warning pilots of the possibility of this anomaly; telling them how to rectify it (close up the discontinuity with D257G immediately and re-engage LNAV) and that a report is mandatory; so that the company and legal authorities can quantify the problem in order to have a more thorough investigation.
Original NASA ASRS Text
Title: B767 Captain reported that on numerous occasions; departing Runway 27L at EGLL on the CPT 3G departure; that just before the blue intercept circle for the LON 257 deg. radial inbound to D257G the blue intercept circle goes away and the D257G waypoint becomes white. It is necessary to close the discontinuity and reengage LNAV.
Narrative: EGLL CPT 3G departure. This is my 6th report filed on this anomaly in the past 2 years. Our 767s have an issue with the CPT3G departure off of runway 27L at EGLL. Somewhere around 1500' just before the blue intercept circle for the LON 257 deg. radial inbound to N5127.5 W00038.8 (D257G in the FMC) the blue intercept circle goes away and the D257G waypoint becomes white (was magenta). The FMC issues a message 'NOT ON INTERCEPT HEADING' because the intercept circle has gone away. I have noticed this anomaly for over 15 years off of 27L in our 767-300s.Again; it is my opinion that the company should issue a bulletin warning pilots of the possibility of this anomaly; telling them how to rectify it (close up the discontinuity with D257G immediately and re-engage LNAV) and that a report is mandatory; so that the company and legal authorities can quantify the problem in order to have a more thorough investigation.
Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.