Date: 201208
Local time of day: 0601-1200
Location: ZZZ.Airport, US
Flight conditions: VMC
Light: Daylight
Aircraft: B737-700
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Flight phase: Initial Approach
Airspace: Class B ZZZ
ATC / advisory: Tower ZZZ
Aircraft component: Flap Control (Trailing & Leading Edge)
Component problem: Malfunctioning
Reporter organization: Air Carrier
Reporter function: First Officer; Pilot Flying
Second reporter function: Pilot Not Flying; Captain
Anomaly: Aircraft Equipment Problem Critical
Detector: Automation Aircraft Other Automation; Person Flight Crew
When detected: In-flight
Result: Flight Crew Executed Go Around / Missed Approach; Flight Crew Landed in Emergency Condition; General Declared Emergency; General Maintenance Action
Contributing factors: Aircraft; Human Factors; Procedure
Primary problem: Aircraft

Narrative: This was the first leg of day one of a three-day [trip]. The aircraft had a flap history in the logbook and the Captain and I had noted that prior to our departure. We also noted that it had a check flight as well. We tookoff with no problem and noted that the flaps were in the takeoff position on the flap gauge when we ran the checklist. We climbed to altitude without a problem. I did notice the flap indicator showed a slight split and did mention it to the Captain. Now inbound to our destination; and on the arrival; the runway we were planning on was changed. We got our charts out and loaded up the box for that approach and runway and the Captain briefed it. This happened in a fairly short amount of time. The Captain asked for flaps and landing gear down. I was focusing on the approach and stated we were looking a little high and not slowing. The Captain disconnected the autopilot and shallowed the descent and asked for more flaps when we got an aural warning of 'too low flaps'. The Captain immediately added power and we went around. I backed him up on the go-around and noticed on the flap gauge the flaps were up. There were many vectors. ATC finally started to give us longer straight line vectors. The many radio calls that we were getting; while trying to work through the QRH were distracting. I stated to ATC we were trying to get through a checklist and we were not ready for vectors for another approach at that time. We did get longer heading vectors so we could work through the QRH and work on the problem. The Captain elected to transfer control of the aircraft to me while he ran the QRH. We could not get the flaps to come down after running the QRH. We planned on a no flaps landing per the QRH and declared an emergency with ATC. We requested the longest runway. The Captain ran the performance calculations and referenced the QRH for our condition of a flaps up high speed landing. The Captain had notified the flight attendants and passengers of our condition and what our plan was. When the Captain was through talking with the Flight Attendants and did a PA to the passengers; he took back control of the aircraft. I stated to ATC that we were ready for the approach. ATC vectored and cleared us for the approach. We backed up the visual approach with the ILS and were cleared to land by Tower. We made the approach as briefed and the Captain landed without further incident. After exiting the runway and talking with Ground we made sure fire and rescue gave us the all clear to taxi to our gate and they said they would also follow us to the gate.


Second narrative: As we descended on the arrival and VNAV path; I noticed the aircraft speed had not slowed accordingly. I glanced at the flaps indicator and saw the flaps were still in the up position. Just as I was advancing the thrust levers to go around; we received the 'Too Low Flaps' aural annunciator.We informed ATC that we were going around and received vectors to leave the area for a chance to troubleshoot the situation. After completing our checklists and reviewing the procedures for a flaps up landing; we declared an emergency and received vectors for a visual approach. The emergency vehicles were in place. We landed uneventfully. After taxiing off the runway; the emergency personnel visually assessed the condition of the tires. Once on the ramp; we were towed to the gate.


Synopsis: B737-700 flight crew report accepting an aircraft that had a history of flap problems. On the first approach the flaps failed to extend when selected; but this is not detected by the crew until the EGPWS annunciates 'to low; flaps.' A go around is initiated; QRH procedures are complied with; an emergency is declared; and a flaps up landing ensues.