A flight crew reported two fixes in their flight plan dropped out of their FMC causing them to fly o...

Attributes
ACN	1650829
Time
Date	201905
Local Time Of Day	1801-2400
Place
Locale Reference	DTW.Airport
State Reference	MI
Aircraft 1
Make Model Name	Embraer Jet Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Climb
Route In Use	SID LIDDS1
Flight Plan	IFR
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine Flight Crew Instrument
Person 2
Function	Pilot Flying First Officer
Qualification	Flight Crew Instrument Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy Deviation - Procedural Clearance Deviation - Track / Heading All Types

Narrative:

After getting cleared direct to kzlov on the LIDDS1 departure the next 2 fixes apparently somehow dropped out of the flight plan unknown to us. The full departure was loaded in the FMS and checked. We were told we did not have to follow the altitude restriction and to resume normal speed. We were on course to lidds and then apparently noonr and zeyou were missing; as pilot monitoring I did not notice that and we were on course for grivy when ATC asked. After speaking with the center duty manager he indicated to me that this has been occurring and they are trying to figure out why. It appears that the database dropped those fixes which is what he indicated other crews have told him. We departed runway 22L and again we had checked the fixes. This should be added to 10-7 company pages to watch out for.

Original NASA ASRS Text

Title: A Flight Crew reported two fixes in their flight plan dropped out of their FMC causing them to fly off course.

Narrative: After getting cleared direct to KZLOV on the LIDDS1 departure the next 2 fixes apparently somehow dropped out of the flight plan unknown to us. The full departure was loaded in the FMS and checked. We were told we did not have to follow the altitude restriction and to resume normal speed. We were on course to LIDDS and then apparently NOONR and ZEYOU were missing; as Pilot Monitoring I did not notice that and we were on course for GRIVY when ATC asked. After speaking with the Center Duty Manager he indicated to me that this has been occurring and they are trying to figure out why. It appears that the database dropped those fixes which is what he indicated other crews have told him. We departed Runway 22L and again we had checked the fixes. This should be added to 10-7 company pages to watch out for.

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.

A flight crew reported two fixes in their flight plan dropped out of their FMC causing them to fly off course.