Narrative:

During my preflight walk around; I was looking at the left side landing light. It looked inoperative but with the side light it was hard to tell. So I looked at the right side to compare what it should look like and confirmed that the left side was out. So at that point I continued on with my walk around. Once I got back up to the flight deck I informed the captain of the inoperative landing light where he then completed the MEL with maintenance control. After pushback and engine start; it was noticed that the captain's pitot heat light was illuminated. I continued with my after start flow and then we did the before taxi checklist. Once that was completed we ran the QRH for the captain pitot light and determined it needed to be meled. Once the paperwork was completed we continued to the runway.during the takeoff roll; where I was the pilot flying; the captain called for the reject around 70 kts. We cleared the runway and ran pwb brake cooling and determined it was safe to proceed back to the gate. Once at the gate the captain asked me to do a quick walk around of the aircraft. As soon as I got down to the aircraft I noticed that the captain-side pitot tube was missing from the aircraft. I was not part of the conversation that determined when the pitot tube may have departed the aircraft; but was informed that I must have missed that it was missing during my walk around. Shortly after that I recalled that after looking at the lights I must have never went back to the captain side of the nose to start the preflight from my normal starting point. This event was a great reminder that when doing [an] important task; once you get distracted you should always start from the beginning and start the task over again so important items aren't missed.

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Original NASA ASRS Text

Title: B737-700 flight crew reported a rejected takeoff due to a lack of airspeed indication on the Captain's side.

Narrative: During my preflight walk around; I was looking at the left side landing light. It looked inoperative but with the side light it was hard to tell. So I looked at the right side to compare what it should look like and confirmed that the left side was out. So at that point I continued on with my walk around. Once I got back up to the flight deck I informed the Captain of the inoperative landing light where he then completed the MEL with Maintenance Control. After pushback and engine start; it was noticed that the Captain's pitot heat light was illuminated. I continued with my After Start Flow and then we did the Before Taxi Checklist. Once that was completed we ran the QRH for the Captain Pitot light and determined it needed to be MELed. Once the paperwork was completed we continued to the runway.During the takeoff roll; where I was the Pilot Flying; the Captain called for the reject around 70 kts. We cleared the runway and ran PWB brake cooling and determined it was safe to proceed back to the gate. Once at the gate the Captain asked me to do a quick walk around of the aircraft. As soon as I got down to the aircraft I noticed that the Captain-side pitot tube was missing from the aircraft. I was not part of the conversation that determined when the pitot tube may have departed the aircraft; but was informed that I must have missed that it was missing during my walk around. Shortly after that I recalled that after looking at the lights I must have never went back to the Captain side of the nose to start the preflight from my normal starting point. This event was a great reminder that when doing [an] important task; once you get distracted you should always start from the beginning and start the task over again so important items aren't missed.

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.