Air carrier first officer reported the FMS began to accelerate beyond 250 knots above 10;000 feet wh...

Narrative:

On departure we were executing the ladyj four (RNAV) departure. Climbing through 10;000 our FMS began to accelerate beyond 250 knots around orosz intersection as programmed in the FMS. The ladyj departure indicates that 250 knots shall be maintained until advised by ATC. We briefed this and were aware of it; however; the way the information is presented is not on the pictorial of the chart and I believe it leaves a significant gap for error; because the flight crew must either assume that the controller will issue normal speed; or the flight crew must constantly ask for normal speed with subsequent controllers. Also; all aircraft are programmed to accelerate to climb speed above 10;000 feet which requires a non-standard method of selecting manual speed versus having the mcdu command speed appropriate to the airspace and configuration of the aircraft. Selecting manual speed could result in a low speed event in the subsequent climb. Just passing orosz the controller issued normal speed; and I believe this was a non-event. On further research this departure is mentioned as a poorly designed departure and I would hazard to guess there are numerous safety reports on it.

Original NASA ASRS Text

Title: Air carrier First Officer reported the FMS began to accelerate beyond 250 knots above 10;000 feet while on the LADYJ FOUR (RNAV) even though the programmed SID requires 250 knots until advised by ATC.

Narrative: On departure we were executing the LADYJ FOUR (RNAV) departure. Climbing through 10;000 our FMS began to accelerate beyond 250 knots around OROSZ Intersection as programmed in the FMS. The LADYJ departure indicates that 250 knots shall be maintained until advised by ATC. We briefed this and were aware of it; however; the way the information is presented is not on the pictorial of the chart and I believe it leaves a significant gap for error; because the flight crew must either assume that the Controller will issue normal speed; or the flight crew must constantly ask for normal speed with subsequent controllers. Also; all aircraft are programmed to accelerate to climb speed above 10;000 feet which requires a non-standard method of selecting manual speed versus having the MCDU command speed appropriate to the airspace and configuration of the aircraft. Selecting manual speed could result in a low speed event in the subsequent climb. Just passing OROSZ the Controller issued normal speed; and I believe this was a non-event. On further research this departure is mentioned as a poorly designed departure and I would hazard to guess there are numerous safety reports on it.

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.

Attributes
ACN	1750258
Time
Date	202007
Place
Locale Reference	LAX.Airport
State Reference	CA
Environment
Light	Daylight
Aircraft 1
Make Model Name	Medium Transport
Operating Under FAR Part	Part 91
Flight Phase	Climb
Route In Use	Direct SID LADYJ FOUR (RNAV)
Flight Plan	IFR
Component
Aircraft Component	Navigational Equipment and Processing
Person 1
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 40 Flight Crew Total 10100 Flight Crew Type 500
Events
Anomaly	Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Deviation - Speed All Types

Air carrier first officer reported the FMS began to accelerate beyond 250 knots above 10;000 feet while on the ladyj four (RNAV) even though the programmed SID requires 250 knots until advised by ATC.