Date: 201812
Local time of day: 0601-1200
Location: LAX.Airport, CA
Aircraft: EMB-505 / Phenom 300
Operator: Air Taxi
Operating under: Part 135
Flight plan: IFR
Mission: Passenger
Flight phase: Takeoff / Launch
Airspace: Class B LAX
Aircraft component: Radio Altimeter
Component problem: Malfunctioning
Reporter organization: Air Taxi
Reporter function: First Officer; Pilot Not Flying
Reporter qualification: Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Human factors: Human-Machine Interface
Anomaly: Aircraft Equipment Problem Less Severe; Deviation - Speed All Types; Deviation / Discrepancy - Procedural Published Material / Policy
Detector: Person Flight Crew
When detected: In-flight; Taxi
Result: Flight Crew Overcame Equipment Problem
Contributing factors: Aircraft; Company Policy
Primary problem: Aircraft

Narrative: I was the PNF/FO (Pilot Not Flying / First Officer) and sitting in the right seat for our passenger flight from LAX on Aircraft X. On taxi out we received a 'traffic' call from the TCAS. According to a Phenom Newsletter; this is a known issue caused by certain asphalt/concrete material in the ramp/taxi way material affecting the radar altimeter. I followed the instruction of the newsletter article and turned the TCAS to Standby and we continued to taxi. We were told 25R for takeoff and crossed 25L and was holding short of 25R at F when we were cleared for takeoff. We were not expecting it since tower didn't inform us to expect an intersection takeoff. I was expecting to taxi across and full length for 25R. Because of this and alternate heading given by the tower other than what was published on SID I forgot to turn the transponder back to Auto. After takeoff I called positive rate and the PF (Pilot Flying) called gear up. As soon as I selected gear up we immediately received a 'TOO LOW GEAR'; this startled us. I looked down to make sure the gear was coming up and we were not sinking and hit the OK button. About the same time we got a yellow message telling us that the transponder was in standby. Realizing my mistake; I turned the transponder back to Auto. I noticed at that time we were also above 400ft; so I called [flaps retract] and selected flaps 0. At that same time I saw that our speed was approaching 180kts and called to the PF to watch his speed. He acknowledged it but not in time to keep the speed from exceeding the 180kt flap speed limit. We received one 'High Speed' aural warning and reached 185kts before the flaps retracted fully and red/white barber pole disappeared. On the way to [our destination] we discussed the article about the TCAS calls on the ground and the Radar Altimeter and how we never had the 'Too Low Gear' before on takeoff. We monitored the Radar Altimeter on the way into [our destination] and it worked perfectly. But considering the 'Too Low Gear' warning we decided to write that up along with the flap overspeed. In hindsight maybe we should have thought about an MEL for the Radar Altimeter. I will do this in the future when I get these spurious TCAS alerts when on the ground. How are we to tell if it is the material in the asphalt/concrete or if the Radar Altimeter really has issues? Should there be an email or another article be put out to rescind the previous article? Also LAX tower should give some notice to pilots if there are going to assigned an intersection takeoff.




Synopsis: EMB505 Captain reported a TCAS alert for traffic during taxi; a 'too low gear' warning on climb out; and a flap overspeed.