Log in
Forgot password ?
Become a member for free
Sign up
Sign up
New member
Sign up for FREE
New customer
Discover our services
Dynamic quotes 

MarketScreener Homepage  >  Equities  >  Nyse  >  The Boeing Company    BA


SummaryMost relevantAll NewsAnalyst Reco.Other languagesPress ReleasesOfficial PublicationsSector newsMarketScreener Strategies

Boeing 777's Midair Malfunction Puts Focus on Engine Cover

02/23/2021 | 05:21pm EST

By Alison Sider

The midair breakdown of a jet engine that spewed a trail of metal over a Colorado town is putting regulatory focus on the design and strength of engine coverings.

Four minutes into the Honolulu-bound United Airlines flight from Denver on Saturday, pilots and passengers heard a loud bang, and the plane's right engine began vibrating, according to the National Transportation Safety Board's preliminary analysis of the cockpit's voice recorder. Within 20 minutes, the plane had landed on the runway back at Denver International Airport, with no injuries to anyone on the ground or aboard the plane.

However, large pieces of debris plunged from the sky, landing in yards and a soccer field. Photos and videos taken by passengers show the airplane's right engine, stripped of its front coverings, oscillating and in flames.

Investigators have homed in on a fan blade that had weakened over time and broke off at its base. That fast-spinning blade remnant appears to have sheared a second blade roughly in half. But investigators are still trying to understand why the engine's front external cover, known as the cowling, was then ripped away, according to NTSB Chairman Robert Sumwalt. Something similar happened in a handful of other engine failures caused by broken fan blades in recent years.

"Certainly, we don't expect the cowling to separate like that," Mr. Sumwalt said this week, during a briefing with reporters. He added that the safety board's investigators would examine the engine's maintenance and inspection records.

Such damage to external engine sections isn't supposed to happen under current manufacturing and inspection systems, which have ushered in an era of record airline safety in the U.S. and globally. The incident raises concerns about whether engine coverings are too vulnerable to damage from engine components flying forward at great speed, in addition to questions about why the fan blades broke, some safety experts said.

Alan Diehl, a former U.S. aviation accident investigator, said investigators and regulators will need to think about the integrity of the structures that house aircraft engines and how they are designed and certified. If one were to fail, that can pose a danger to the rest of the aircraft. "They're going to have to reexamine that," he said.

Concerns about engine coverings also came to the fore after a Southwest Airlines flight in April, 2018, when remnants of engine blades broke off and battered front engine coverings. When airflow and severe vibration then broke up the damaged cover, fragments were hurled into the wings and body of the Boeing 737. One piece blasted out a cabin window, partially sucking out the passenger.

After that deadly Southwest engine failure, then-acting Federal Aviation Administration chief Dan Elwell said the agency would conduct a broad safety review focused on potential threats from structural failures of front engine coverings. Airborne breakups of such ancillary parts typically haven't been considered in safety analyses or mandatory certification standards for modern jet engines.

In responses last year to recommendations the NTSB made after the Southwest incident, FAA Administrator Steve Dickson said the agency was working with Boeing Co. on a design change for the type of engine involved in the incident, and was reviewing design and certification standards for engine casings to determine whether broader changes were needed beyond that engine type.

The FAA is working on additional responses to the NTSB, a spokesman said Tuesday.

The engine failure Saturday was the third in a string of strikingly similar incidents involving the same type of Pratt & Whitney-made engine on Boeing 777 aircraft. In all three cases, a fan blade showing signs of fatigue largely broke off, and a second blade was also fractured. In all three cases, damaged engine coverings broke off.

Pratt & Whitney, a unit of Raytheon Technologies Corp., declined to comment Tuesday. On Sunday the engine maker said it was working with regulators and investigators.

The FAA said it had been in the process of evaluating a Dec. 4 engine failure on a Japan Airlines flight to Tokyo when the weekend incident happened.

A shielding ring surrounding the engine is designed to prevent rapidly spinning internal parts from shooting through the engine's outer casing.

Ray Valeika, a former maintenance and engineering chief at Delta Air Lines Inc., said the prospect that a broken fan blade can shoot forward out of the engine rather than through the sides of the casing necessitates a new approach to how these elements are designed and approved by regulators. It is possible, he said, that more-efficient fan blades aren't behaving in the way that regulators expected when the testing systems and regulations were designed.

"We have to think differently about containment," he said. "I think there needs to be a design review and a fault analysis review to see if we need to change the design criteria," he said.

Engines are tested to make sure they can survive if a fan blade breaks off. But those tests differ from conditions during flight in key ways, according to a safety board report following a 2018 engine failure on another United flight to Hawaii, also linked to a weakened fan blade that broke off. In that incident, fan blade fragments spiraled forward and engine covering pieces broke off.

During the tests, an inlet was attached to the engine, but it wasn't made of the same material as the inlet used on the aircraft, the NTSB report said. And coverings that surround the fan aren't required to be on during the tests, according to that report.

The NTSB's report last year didn't recommend changes to the testing procedure, and the safety board didn't respond to questions Tuesday about whether it will advise changes now.

Write to Alison Sider at alison.sider@wsj.com

(END) Dow Jones Newswires

02-23-21 1721ET

Stocks mentioned in the article
ChangeLast1st jan.
RAYTHEON TECHNOLOGIES CORPORATION -1.81% 71.99 Delayed Quote.2.53%
SOUTHWEST AIRLINES -0.31% 58.13 Delayed Quote.24.72%
THE BOEING COMPANY -2.05% 212.01 Delayed Quote.-0.96%
UNITED CONTINENTAL HOLDINGS, INC. 1.74% 52.68 Delayed Quote.21.80%
02/26Boeing CEO asked to testify in crash litigation, lawmakers demand FAA release..
02/26MARKET CHATTER : 737 MAX Crash Lawyers Seek Testimony from Two Boeing CEOs
02/26AIRBUS : Norwegian Air books $1.5 billion charge as it seeks fresh start
02/26GLOBAL MARKETS LIVE: Aibnb, Salesforce, AT&T
02/26Norwegian Air books $1.5 bln charge
02/26BOEING : Sensor Issue Makes Boeing 777 Land Unexpectedly In Moscow
02/26AEROFLOT RUSSIAN AIRLINES : Boeing 777 makes emergency landing in Moscow after e..
02/26Airbus exploring hybrid-electric aircraft technology
02/26MARKET CHATTER : Thai Airways Seeks Buyers for 10 Passenger Planes, Engines
02/26BOEING : to Pay $6.6 Million in Penalties to FAA
More news
Financials (USD)
Sales 2021 81 071 M - -
Net income 2021 922 M - -
Net Debt 2021 44 767 M - -
P/E ratio 2021 142x
Yield 2021 -
Capitalization 124 B 124 B -
EV / Sales 2021 2,08x
EV / Sales 2022 1,83x
Nbr of Employees 141 000
Free-Float 57,5%
Duration : Period :
The Boeing Company Technical Analysis Chart | MarketScreener
Full-screen chart
Technical analysis trends THE BOEING COMPANY
Short TermMid-TermLong Term
Income Statement Evolution
Mean consensus HOLD
Number of Analysts 25
Average target price 229,05 $
Last Close Price 212,01 $
Spread / Highest target 44,3%
Spread / Average Target 8,04%
Spread / Lowest Target -22,2%
EPS Revisions
Managers and Directors
David L. Calhoun President, Chief Executive Officer & Director
Gregory D. Smith CFO & Executive VP-Enterprise Operations
Lawrence W. Kellner Non-Executive Chairman
Gregory L. Hyslop Chief Engineer, EVP-Engineering, Test & Technology
Susan Doniz Chief Information Officer & SVP-Data Analytics
Sector and Competitors
1st jan.Capitalization (M$)
AIRBUS SE6.83%94 784
TEXTRON INC.4.16%11 443