Air carrier flight crew reported a temporary dual FMS failure on departure.

Attributes
ACN	1566862
Time
Date	201808
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Night
Aircraft 1
Make Model Name	B767 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Initial Climb
Flight Plan	IFR
Component
Aircraft Component	FMS/FMC
Person 1
Function	Pilot Not Flying Captain
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Pilot Flying First Officer
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Clearance Deviation - Track / Heading All Types

Narrative:

Cleared for takeoff on the RNAV SID. The initial climb out; after contacting departure; ATC asked if we were flying the departure procedure. As I replied yes; I quickly realized we had lost our fixes on the legs page and had failed to complete the SID turn at 540 ft. I immediately advised that we were unable RNAV and requested a vector. They gave us a heading. Eventually they asked if we could proceed direct to fixes on the SID. After unsuccessfully attempting to enter any fixes on the legs page; both FMC's displayed 'standby; reset' message. After a few minutes; the message went away and I was able to change FMC pages and saw that the route page had dropped out. After entering the data back into the route page; we were able to navigate via the SID. Advised ATC that our FMC navigation was back up and we were able to proceed. No further issues. Upon landing at destination; advised maintenance and on-duty tech about our write up as to the route dropping from FMC's after takeoff.

Original NASA ASRS Text

Title: Air carrier flight crew reported a temporary dual FMS failure on departure.

Narrative: Cleared for takeoff on the RNAV SID. The initial climb out; after contacting departure; ATC asked if we were flying the departure procedure. As I replied yes; I quickly realized we had lost our fixes on the legs page and had failed to complete the SID turn at 540 ft. I immediately advised that we were unable RNAV and requested a vector. They gave us a heading. Eventually they asked if we could proceed direct to fixes on the SID. After unsuccessfully attempting to enter any fixes on the legs page; both FMC's displayed 'Standby; Reset' message. After a few minutes; the message went away and I was able to change FMC pages and saw that the route page had dropped out. After entering the data back into the Route Page; we were able to navigate via the SID. Advised ATC that our FMC navigation was back up and we were able to proceed. No further issues. Upon landing at destination; advised Maintenance and on-duty tech about our write up as to the route dropping from FMC's after takeoff.

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.