Iah controller reports of taxi instructions given to two aircraft. One aircraft doesn't follow instr...

Attributes
ACN	1240349
Time
Date	201502
Local Time Of Day	1801-2400
Place
Locale Reference	IAH.Airport
State Reference	TX
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	Medium Transport Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	Taxi
Route In Use	None
Flight Plan	IFR
Aircraft 2
Make Model Name	Large Transport Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	Taxi
Route In Use	None
Flight Plan	IFR
Person 1
Function	Ground
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 3
Person 2
Function	Pilot Not Flying First Officer
Events
Anomaly	ATC Issue All Types Conflict Ground Conflict Critical Deviation - Procedural Clearance

Narrative:

Aircraft X called asking to taxi to his gate on the south ramp. Aircraft Y was told to push tail east do not block taxiway wb. I instructed aircraft X to taxi via taxiway na and nr and hold short taxiway wb. I went back to aircraft X and told him behind aircraft Y pushing [from] gate to continue his taxi to spot 3 and then contact ramp. I noticed aircraft X at spot 3 when aircraft Y called and asked if the aircraft X was supposed to have given way because they had to slam on their brakes and flight attendants were instructed to take their seats. Aircraft Y asked me what his callsign was because he was going to call his company. I told aircraft Y his callsign at that time I informed the supervisor of the event taken place. Gate A29 and A30 are not visible from the tower nor do the aircraft show up on the asde-X when pushing from the gate do they show up sometimes when the push is complete.if a camera was hung close to the gates and a monitor was at the GC1 position so they could see the aircraft push and possibly have the city paint another spot on the ramp just for those 2 gates to push back onto.

Original NASA ASRS Text

Title: IAH Controller reports of taxi instructions given to two aircraft. One aircraft doesn't follow instructions and causes the other aircraft to slam on the brakes. Pilot of violating aircraft reports that they thought they were clear to taxi behind the other aircraft because it wasn't moving.

Narrative: Aircraft X called asking to taxi to his gate on the south ramp. Aircraft Y was told to push tail east do not block taxiway WB. I instructed Aircraft X to taxi via taxiway NA and NR and hold short taxiway WB. I went back to Aircraft X and told him behind Aircraft Y pushing [from] gate to continue his taxi to spot 3 and then contact ramp. I noticed Aircraft X at spot 3 when Aircraft Y called and asked if the Aircraft X was supposed to have given way because they had to slam on their brakes and flight attendants were instructed to take their seats. Aircraft Y asked me what his callsign was because he was going to call his company. I told Aircraft Y his callsign at that time I informed the supervisor of the event taken place. Gate A29 and A30 are not visible from the tower nor do the aircraft show up on the ASDE-X when pushing from the gate do they show up sometimes when the push is complete.If a camera was hung close to the gates and a monitor was at the GC1 position so they could see the aircraft push and possibly have the city paint another spot on the ramp just for those 2 gates to push back onto.

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.

Iah controller reports of taxi instructions given to two aircraft. One aircraft doesn't follow instructions and causes the other aircraft to slam on the brakes. Pilot of violating aircraft reports that they thought they were clear to taxi behind the other aircraft because it wasn't moving.