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19960331044229I

Incident · Minor damage
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FAA incident report · Dorner DO 328-100 · Eugene, OR · March 31, 1996

FAA Aviation Safety Information Portal

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Date
March 31, 1996 · 06:30 local
Place
Eugene, OR
Phase of flight
Climb
Operating rules
Air carrier (Part 121)
Damage
Minor damage
Aircraft
N334PH
NTSB investigation
NTSBSEA96IA074
Reported as
Dorner DO328100
People aboard
27
Fatal injuries
0
Pilot’s flight hours
5,266 total178 in the last 90 days
N334PHRegistration cancelled Oct 6, 2014 · Dornier Luftfahrt DO 328-100S/N 3012 · Built 1994Airframe modelDornier Luftfahrt DO 328-100Engine modelPratt & Whitney Canada PW119CTurbo-prop

From the FAA’s Accident/Incident Data System (AIDS), through its Aviation Safety Information Portal, as reported. The NTSB investigates accidents separately, and its record of an accident is the fuller one. The aircraft is matched to the registry by N-number and event date, checked against the reported make and model; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

What happened

The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.

(-5)The flight crew reported that as the airplane was climbing between 14,000 feet and 16,000 feet in light icing conditions, they felt a moderate shudder. The autopilot disconnected, and the airplane immediately rolled 15 degrees to the left. An emergency was declared, and the flight was diverted with no further incident. After landing, examination revealed that a section of the left wing de-icing boot had delaminated. When pressure was applied to the system, a bubble was created. When pressure was off, the delaminated plies were stretched beyond their elastic limits and would not return to the normal shape, thus creating wrinkles. Examination of the plies revealed that there was no evidence of contamination. The separation occurred between the adhesion coat and the knit fabric. The manufacturer of the boot reported that this mode of failure was consistent with an elastromeric construction that had reached the end of its useful life. The outer delaminated plies were found to be unusually durable, which resulted in a large bubble instead of the normally expected 'burst' of the outer plies.

As the FAA filed it

(-5)THE FLIGHT CREW REPORTED THAT AS THE AIRPLANE WAS CLIMBING BETWEEN 14,000 FEET AND 16,000 FEET IN LIGHT ICING CONDITIONS, THEY FELT A MODERATE SHUDDER. THE AUTOPILOT DISCONNECTED, AND THE AIRPLANE IMMEDIATELY ROLLED 15 DEGREES TO THE LEFT. AN EMERGENCY WAS DECLARED, AND THE FLIGHT WAS DIVERTED WITH NO FURTHER INCIDENT. AFTER LANDING, EXAMINATION REVEALED THAT A SECTION OF THE LEFT WING DE-ICING BOOT HAD DELAMINATED. WHEN PRESSURE WAS APPLIED TO THE SYSTEM, A BUBBLE WAS CREATED. WHEN PRESSURE WAS OFF, THE DELAMINATED PLIES WERE STRETCHED BEYOND THEIR ELASTIC LIMITS AND WOULD NOT RETURN TO THE NORMAL SHAPE, THUS CREATING WRINKLES. EXAMINATION OF THE PLIES REVEALED THAT THERE WAS NO EVIDENCE OF CONTAMINATION. THE SEPARATION OCCURRED BETWEEN THE ADHESION COAT AND THE KNIT FABRIC. THE MANUFACTURER OF THE BOOT REPORTED THAT THIS MODE OF FAILURE WAS CONSISTENT WITH AN ELASTROMERIC CONSTRUCTION THAT HAD REACHED THE END OF ITS USEFUL LIFE. THE OUTER DELAMINATED PLIES WERE FOUND TO BE UNUSUALLY DURABLE, WHICH RESULTED IN A LARGE BUBBLE INSTEAD OF THE NORMALLY EXPECTED 'BURST' OF THE OUTER PLIES.

NTSB investigation

The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.

NTSB SEA96IA074Incident · No injuriesIncident investigationFinal reportEugene, ORdelamination of the wing de-icing boot, due to the boot reaching its life limit.Mar 31, 1996 · Minor damage

Other reports on N334PH · 1

Matched to the same aircraft by N-number and date.

Incident 19951214045299IIn Traffic Pattern-Circling · Seattle, WALightning strike during approach. Damaged left wing tip. Nav light assembly missing. Burn marks on rivets.Dec 14, 1995 · Minor damage