Douglas DC-9-32 N923L

Summary

On 4 May 1984 at about 15:24 local time, a Douglas DC-9-32 registered N923L was involved in an incident near Mount Vernon, Illinois, United States. 84 people were on board and nobody was injured. No probable cause statement is available for this record.

Date

4 May 1984 at 15:24

Classification

Incident

Location

Mount Vernon, Illinois, United States

Coordinates

38.3097, -88.9104

Aircraft

Douglas DC-9-32

Registration

N923L

Category

Airplane

Engines

2

Operator

Not recorded

Operating rule

Part 121: Air Carrier

Purpose of flight

Unknown

Phase of flight

Not recorded

Route

St. Louis → Louisville

Aircraft damage

Not recorded

Weather

VMC

Light

Day

NTSB number

ATL84IA160

Nobody was injured.

The NTSB has not published a probable cause for this record. No probable cause statement is present in the source data.

Nothing about the cause is stated here that is not in the source record.

Read the full NTSB narrative

KANSAS CITY ARTCC (ZKC) HAD CLEARED OZARK FLT 709 (A DC-9, N923L) TO CRUISE AT FL270. WHILE PROCEEDING ESE NEAR THE EDGEOF THE ZKC AREA, THE DC-9 CONVERGED ON ZORRO 11 (A FLT OF 3 F-4'S). THE F-4'S HAD BEEN CLEARED BY INDIANAPLOLIS ARTCC (ZID) TO PROCEED WESTBOUND AT FL260 TO RENDESVOUS WITH A KC-135 TANKER (SHAKE 81) TO REFUEL ON AERIAL REFUELING ROUTE AR110W. THE BEGINNING OF AR110W WAS IN THE ZID AREA; FROM THERE IT CONTINUED WESTBOUND INTO THE ZKC AREA. THE TANKER WASORBITING UNDER CONTROL OF ZKC & WAS CLEARED TO MAINTAIN BLOCK ALT FL260 TO FL290. ZID CLEARED THE F-4'S TO THE TANKER FREQ WITHOUT HANDING THEM OFF TO ZKC & WITHOUT OBTAINING APPROVAL FROM EITHER ZKC OR THE TANKER. AFTER ESTABLISHING RADIO CONTACT, THE TANKER CREW INCORRECTLY CLEARED THE F-4'S TO CLIMB TO FL270. WHEN THE ZKC CONTROLLER REALIZED THE F-4'S & DC-9 WERE CONVERGING, HE TOLD THE DC-9 CREW TO IMMEDIATELY TURN LEFT. THE DC-9 CREW SAW THE F-4'S & TOOK EVASIVEACTION. ZID HAD NOT PROPERLY COORDINATED THE F-4S' POSITION & NONE OF THE PLTS WERE INFORMED OF CONFLICTING TRAFFIC.

Quoted verbatim from the NTSB record.