Captain of DHC8-100 encountered wake turbulence while on approach to mia. Flight was 10 mi from runway and following 2 B727's. After hitting the second wake, flight crew adjusted GS to remain 2 1/2 dots above. Reporter participated in the wake turbulence callback problem.

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Attributes
ACN	357624
Time
Date	199701
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mia
State Reference	FL
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : mia
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	descent : approach
Route In Use	approach : straight in arrival other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	descent : approach
Route In Use	approach : straight in arrival other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : commercial
Experience	flight time last 90 days : 225 flight time total : 13500 flight time type : 4400
ASRS Report	357624
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	inflight encounter other
Independent Detector	other flight crewa
Resolutory Action	flight crew : exited adverse environment flight crew : took evasive action
Consequence	Other
Supplementary
Air Traffic Incident	other

Narrative:

On ILS runway 9R mia just inside gritt descending out of 3000 ft and following 2 B727's, the closest 4 1/2 to 5 mi ahead, we encountered wake turbulence on the GS, leveled out to approximately 1 1/2 dots above GS and less than 45 seconds later we were again hit by wake turbulence, this time encountering immediate rolls of 30 degrees left and right requiring evasive control action and application of cruise power. Since it was VFR and a long runway, continued approach at or above 2 dots high on GS. Notified tower of conflict. We can only assume preceding aircraft were high on the approach. Callback conversation with reporter revealed the following information: reporter participated in wake turbulence callback program. See separate report for details.

Original NASA ASRS Text

Title: CAPT OF DHC8-100 ENCOUNTERED WAKE TURB WHILE ON APCH TO MIA. FLT WAS 10 MI FROM RWY AND FOLLOWING 2 B727'S. AFTER HITTING THE SECOND WAKE, FLC ADJUSTED GS TO REMAIN 2 1/2 DOTS ABOVE. RPTR PARTICIPATED IN THE WAKE TURB CALLBACK PROB.

Narrative: ON ILS RWY 9R MIA JUST INSIDE GRITT DSNDING OUT OF 3000 FT AND FOLLOWING 2 B727'S, THE CLOSEST 4 1/2 TO 5 MI AHEAD, WE ENCOUNTERED WAKE TURB ON THE GS, LEVELED OUT TO APPROX 1 1/2 DOTS ABOVE GS AND LESS THAN 45 SECONDS LATER WE WERE AGAIN HIT BY WAKE TURB, THIS TIME ENCOUNTERING IMMEDIATE ROLLS OF 30 DEGS L AND R REQUIRING EVASIVE CTL ACTION AND APPLICATION OF CRUISE PWR. SINCE IT WAS VFR AND A LONG RWY, CONTINUED APCH AT OR ABOVE 2 DOTS HIGH ON GS. NOTIFIED TWR OF CONFLICT. WE CAN ONLY ASSUME PRECEDING ACFT WERE HIGH ON THE APCH. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR PARTICIPATED IN WAKE TURB CALLBACK PROGRAM. SEE SEPARATE RPT FOR DETAILS.

Data retrieved from NASA's ASRS site as of July 2007 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.