Dc-9 experiences wake turbulence following a B-727.

Attributes
ACN	299319
Time
Date	199503
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ord
State Reference	IL
Altitude	agl bound lower : 100 agl bound upper : 100
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : ord tower : atl
Operator	common carrier : air carrier
Make Model Name	DC-9 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : flight engineer pilot : cfi
Experience	flight time last 90 days : 45 flight time total : 25000
ASRS Report	299319
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	inflight encounter other other anomaly
Independent Detector	other flight crewa
Resolutory Action	none taken : insufficient time
Consequence	Other
Supplementary
Air Traffic Incident	other

Narrative:

This letter is in response to callback #189 concerning wake-turbulence. I have had 2 occurrences in my career. The first was in the late 1960's. Leaving jfk, at night, IFR, encountered turbulence climbing piper apache out around 1500 ft. To this day, I'm not sure whether we made a complete roll. It did require a rapid recovery from a pretty unusual attitude when I could finally read the instruments. The second encounter was at ohr. I was first officer on a dc-9. Inside the MM we were placed into an immediate 90 degree bank to the right, about 100 ft above the ground. The captain applied full power and corrective controls and executed a successful go around. The WX was clear with a very light breeze. The aircraft we were following, at normal spacing, was a B-727. This incident occurred in 1975. I have treated all jet aircraft with respect ever since, regardless of size. I am presently instructing light airplane CFI and cfii students. My main theme is, if you are in a light aircraft, treat all airplanes king air size or larger as if they were all 747's. Your light aircraft might not pass through the turbulence fast enough to recover.

Original NASA ASRS Text

Title: DC-9 EXPERIENCES WAKE TURB FOLLOWING A B-727.

Narrative: THIS LETTER IS IN RESPONSE TO CALLBACK #189 CONCERNING WAKE-TURB. I HAVE HAD 2 OCCURRENCES IN MY CAREER. THE FIRST WAS IN THE LATE 1960'S. LEAVING JFK, AT NIGHT, IFR, ENCOUNTERED TURB CLBING PIPER APACHE OUT AROUND 1500 FT. TO THIS DAY, I'M NOT SURE WHETHER WE MADE A COMPLETE ROLL. IT DID REQUIRE A RAPID RECOVERY FROM A PRETTY UNUSUAL ATTITUDE WHEN I COULD FINALLY READ THE INSTS. THE SECOND ENCOUNTER WAS AT OHR. I WAS FO ON A DC-9. INSIDE THE MM WE WERE PLACED INTO AN IMMEDIATE 90 DEG BANK TO THE R, ABOUT 100 FT ABOVE THE GND. THE CAPT APPLIED FULL PWR AND CORRECTIVE CTLS AND EXECUTED A SUCCESSFUL GAR. THE WX WAS CLR WITH A VERY LIGHT BREEZE. THE ACFT WE WERE FOLLOWING, AT NORMAL SPACING, WAS A B-727. THIS INCIDENT OCCURRED IN 1975. I HAVE TREATED ALL JET ACFT WITH RESPECT EVER SINCE, REGARDLESS OF SIZE. I AM PRESENTLY INSTRUCTING LIGHT AIRPLANE CFI AND CFII STUDENTS. MY MAIN THEME IS, IF YOU ARE IN A LIGHT ACFT, TREAT ALL AIRPLANES KING AIR SIZE OR LARGER AS IF THEY WERE ALL 747'S. YOUR LIGHT ACFT MIGHT NOT PASS THROUGH THE TURB FAST ENOUGH TO RECOVER.

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.