ATR ATR-42 N423MQ

Summary

On 18 December 1986 at about 13:59 local time, a ATR ATR-42 registered N423MQ was involved in an incident near Detroit, Michigan, United States. 41 people were on board and nobody was injured. No probable cause statement is available for this record.

Date

18 December 1986 at 13:59

Classification

Incident

Location

Detroit, Michigan, United States

Nearest airport

Detroit Metro (DTW)

Coordinates

42.2191, -83.3497

Aircraft

ATR ATR-42

Registration

N423MQ

Category

Airplane

Engines

2

Operator

Not recorded

Operating rule

Part 121: Air Carrier

Purpose of flight

Unknown

Phase of flight

Not recorded

Route

Traverse City → Unknown

Aircraft damage

Not recorded

Weather

VMC

Light

Day

NTSB number

DCA87IA015

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

DRG ARR, THE FLT WAS VECTORED FOR AN ILS RWY 3R APCH. AT THAT TIME, ATIS INFO INDCD MOD MIXED ICING IN CLDS. THE CAPT RPRTD THE ACFT ENTERED THE CLOUD TOPS AT 5500', WAS IN THE CLDS APRX 5 MIN & ACCUMULATED ABT 1.5' OF RIME ICE. HE STATEDICE ACCUMULATION WAS RAPID, SO THEY DECIDED TO WAIT UNTIL THEY WERE IN THE CLR TO CYCLE THE BOOTS TO PREVENT BRIDGING. AFTER INTERCEPTING THE ILS GLIDE SLOPE ON A COUPLED APCH, THE ACFT WAS SLOWED TO EXTD THE GEAR & FLAPS. A CALL FOR 'FLAPS 15' WAS MADE & APRX 3 SEC LATER, THE AUTOPLT DISCONNECTED AS THE ACFT WAS DSCNDG THRU ABT 1900' AGL AT APRX 146 KTS. AT APRX THE SAME TIME FRAME, THE DE-ICE BOOTS WERE CYCLED AS THE ACFT BROKE OUT OF WX & THE ACFT WENT OUT OF CTL. IT ENTERED BANK OSCILLATIONS (UP TO 44 DEG) & ABRUPTLY LOST ABT 500' BEFORE THE CREW RCVRD, BUT THEY LNDD SUCCESSFULLY. INV REVEALED THE RECENTLY TRAINED CREW DIDN'T GET SUFFICIENT TRAINING IN USE OF DE-ICE EQUIP FM COMPANY INSTRUCTORS, WHOWERE TRAINED AT THE FACTORY. AFTER THIS INCIDENT, THE MANUFACTURER REVISED THE FLT MANUAL TO PROVIDE MORE SPECIFIC INFO.

Quoted verbatim from the NTSB record.