Source: s3://data.kl3m.ai/documents/govinfo/USCOURTS/USCOURTS-ca10-08-02245/USCOURTS-ca10-08-02245-0/pdf.json

Nature of Suit Code: 365
Nature of Suit: Personal Injury - Product Liability
Cause of Action: 

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UNITED STATES COURT OF APPEALS 

TENTH CIRCUIT 

INGRID MAGOFFE, as Personal 

Representative of the Estate of Anthony 

Magoffe, deceased, individually and as 

next friend of her minor children Anthony 

James Magoffe and Jimmy Magoffe; 

AZUCENA MICHEL, as Personal 

Representative of the Estate of Camerino 

Michel Ramirez, deceased, individually, 

and as next friend of her minor children, 

Melissa Ornelas Michel, Anthony Ornelas 

Michel, and Melanie Ornelas Michel, and 

JAMES MAGOFFE, individually, 

 Plaintiffs - Appellants, 

v. 

JLG INDUSTRIES, INC, a Pennsylvania 

corporation, 

 Defendant - Appellee. 

UNITED RENTALS NORTHWEST, INC, 

an Oregon corporation, 

 Defendant. 

No. 08-2245 

 (D.C. No. 1:06-CV-00973-MCA-ACT) 

(D. N.M.) 

ORDER AND JUDGMENT*

 *

 This order and judgment is an unpublished decision, not binding precedent. 10th 

Cir. R. 32.1(A). Citation to unpublished decisions is not prohibited. Fed. R. App. 32.1. 

It is appropriate as it relates to law of the case, issue preclusion and claim preclusion. 

Unpublished decisions may also be cited for their persuasive value. 10th Cir. R. 32.1(A). 

Citation to an order and judgment must be accompanied by an appropriate parenthetical 

notation B (unpublished). Id. 

FILED 

United States Court of Appeals 

Tenth Circuit 

April 7, 2010

Elisabeth A. Shumaker 

Clerk of Court

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Before O'BRIEN, SEYMOUR, and GORSUCH, Circuit Judges.

I. INTRODUCTION 

Camerino Ramirez and Anthony Magoffe were working on the platform of a 

scissor lift raised to the height of approximately 46 feet. James Magoffe was supervising 

the work from the ground. Unexpectedly, one of the leveling jacks at the base of the lift 

retracted causing the lift to tip over. Ramirez and Anthony Magoffe were killed. James 

Magoffe was injured. The workers1

 sued the manufacturer of the scissor lift, JLG 

Industries (JLG), and the company from whom their employer, Yearout Mechanical, 

rented the lift, United Rentals Northwest (United Rentals).2

 Relevant here, the complaint 

alleged JLG failed to provide sufficient safety warnings. In fact, United Rentals made 

unauthorized alterations to the lift, bypassing safety mechanisms. The district court 

granted summary judgment in favor of JLG, concluding United Rentals’ alterations to the 

lift were unforeseeable as a matter of law, defeating both strict liability and negligence 

claims. We affirm. 

II. FACTUAL BACKGROUND 

A. The Scissor Lift

In 1999, JLG manufactured a scissor lift and later sold it to United Rentals. As 

 1

 James Magoffe and the representatives of Anthony Magoffe and Camerino 

Ramirez brought the complaint. For the sake of simplicity, we collectively refer to them 

as “Appellants” unless named individually.

2

 United Rentals settled the lawsuit and is not a party to this appeal. 

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described by the district court, a scissor lift is “a portable elevator on wheels with a 

retractable work platform.” (Appellants’ Appx. at 370.) This particular lift, a JLG Model 

500 RTS, moves on four wheels with rubber tires and is capable of extending its work 

platform 50 feet above the ground. It has two control stations—a “ground control 

station” located on the lift’s base and a “platform control console” located on the work 

platform.3

 Most field operations are performed from the platform control console, which 

is connected to the lift’s base by two electrical control cables. It houses numerous 

operating controls, including four leveling jack toggle switches each corresponding to 

one of the four hydraulic leveling jacks located at each corner of the lift’s base. In 

addition, a platform lift switch raises and lowers the work platform and the PQ controller, 

a joystick-style device, controls drive direction and steer angle when the lift is being 

moved horizontally. The platform control console also contains three interrelated speed 

switches: (1) a drive speed switch (allowing either fast or slow drive speed),4

 (2) an 

engine speed switch (allowing either high or low engine speed), and (3) a pump speed 

switch (allowing high or low flow of hydraulic oil).5

 The operation of the lift at high 

speed is attended by noticeably higher engine noise.

The lift is designed with several safety mechanisms. The lift cut out switch 

 3

 The ground control station is not relevant to this appeal. 

4

 At oral argument, JLG indicated fast speed allowed the lift to be driven at two 

miles per hour while slow speed limited the drive speed to one-half mile per hour.

5

 Because the drive speed, engine speed, and pump speed are regulated together by 

the Drive Speed Cut Out Switch (DSCOS), they are collectively referred to as the “highspeed functions.” 

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prohibits the work platform from being raised higher than 22 feet unless the lift is leveled 

and stabilized with the four leveling jacks.6

 The lift also includes a Tilt Alarm Warning 

Horn to alert the operator if the lift is not level (if the base is sloped more than two 

degrees in any direction). 

Another safety device, the Drive Speed Cut Out Switch (DSCOS), is closed only 

when the work platform is stowed (not raised over 6 inches). When the work platform is 

extended above 6 inches, the DSCOS no longer permits the unit’s high-speed functions to 

operate. The DSCOS has another critical function. At the same time it disables the highspeed functions, it disables the leveling jacks by opening a switch.7

 The open switch 

prevents electrical power from reaching the leveling jacks, effectively making them 

inoperable; a user cannot extend or retract the leveling jacks until the work platform is 

lowered to 6 inches or less.

In summary, when the work platform is stowed the leveling jacks can be extended 

or retracted. If the jacks are retracted, the unit can be driven — at the faster speed when 

the work platform is stowed and at the lower speed if the work platform is raised more 

than 6 inches (but less than 22 feet). The work platform cannot be raised above 22 feet 

 6

 From the work platform (in a fully lowered position), the operator uses toggle 

switches to manipulate the leveling jacks until the lift’s base is level, which can be 

determined from a level bubble located on the lift’s base and visible from the work 

platform. 

7

 Industry design standards for scissor lifts with leveling jacks require the 

manufacturer to integrate an interlock device (cut out switch) to prevent a user from 

inadvertently retracting the leveling jacks once they are set. The DSCOS satisfied the 

industry design standard.

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unless the leveling jacks are extended, the jacks are bearing weight, and the unit is level 

(and, of course, the lift cannot then be moved horizontally). Once deployed the jacks 

cannot be moved until the work platform is returned to the stowed position. The leveling 

jacks can only be moved by an operator in the work platform.8

B. Operations and Service Manuals 

When JLG sold the 500RTS to United Rentals, it included an instruction manual 

for users of the lift (the operator’s manual). The operator’s manual includes information 

about the lift’s operating functions and a number of warnings and cautions. A 

“WARNING” indicates the potential of a “HAZARDOUS SITUATION” resulting in 

“SERIOUS INJURY OR DEATH;” a “CAUTION” indicates the potential for a 

“HAZARDOUS SITUATION” resulting in “MINOR OR MODERATE INJURY.” 

(Appellants’ Appx. at 74.) The operator’s manual includes the following warnings: 

ALL INSTRUCTIONS IN THIS MANUAL ARE BASED ON THE USE 

OF THE MACHINE UNDER PROPER OPERATING CONDITIONS, 

WITH NO DEVIATIONS FROM THE ORIGINAL DESIGN. 

ALTERATION AND/OR MODIFICATION OF THE MACHINE IS 

STRICTLY FORBIDDEN, WITHOUT WRITTEN APPROVAL FROM 

JLG 

. . . . 

MODIFICATION OR ALTERATION OF AN AERIAL PLATFORM 

 8

 An operator using the lift with leveling jacks retracted (and at a platform 

elevation of more than 6 inches) cannot move the jacks without first lowering the 

platform to the stowed position. For instance, if the wind came up while an operator was 

working at 18 feet, causing stability concerns, the operator would have to lower the 

platform to the stowed position before he could deploy the leveling jacks. Likewise, if 

the leveling jacks were in use and the platform was raised above 6 inches the operator 

would have to lower the platform to the stowed position before he could adjust the 

leveling jacks. 

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SHALL BE MADE ONLY WITH PRIOR WRITTEN PERMISSION OF 

THE MANUFACTURER. 

. . . . 

NEVER DISABLE OR MODIFY ANY SAFETY DEVICE. ANY 

MODIFICATION OF THE MACHINE IS A SAFETY VIOLATION AND 

IS A VIOLATION OF OSHA RULES. 

(Id. at 74, 200, 201.) The operator’s manual includes a caution reading: “DO NOT 

OPERATE MACHINE IF HIGH DRIVE SPEED, HIGH ENGINE SPEED, AND HIGH 

PUMP SPEED FUNCTIONS OPERATE WHEN [WORK] PLATFORM IS RAISED 

ABOVE THE STOWED POSITION.” (Id. at 204.) The operators manual also includes 

a “DAILY FUNCTIONAL CHECK” with instructions telling users, “A FUNCTIONAL 

CHECK OF ALL SYSTEMS SHOULD BE PERFORMED . . .” and directing users to 

“Raise and lower [the work] platform several times [to] . . . [c]heck that high function 

speeds cut out at 6 in[ches] . . . above fully retracted [work] platform height.”9

 (Id. at 

203.) A warning placard is attached to the lift reading in relevant part: “DAILY 

SAFETY CHECK LIST . . . 2. TEST HIGH SPEED CUTOUT SWITCHES . . . 6. 

CHECK ALL FUNCTIONS . . . TO BE SURE THERE ARE NO MALFUNCTIONS 7. 

DO NOT OPERATE MALFUNCTIONING MACHINE . . . FAILURE TO COMPLY 

WITH AND CORRECT ANY DEFICIENCIES FOUND IN THE ABOVE MAY 

 9

 In other places, the manual reads: “TO AVOID INJURY DO NOT OPERATE A 

MACHINE UNTIL ALL MALFUNCTIONS HAVE BEEN CORRECTED. USE OF A 

MALFUNCTIONING MACHINE IS A SAFETY VIOLATION.” (Appellants’ Appx. at 

202, 203.). In two places it reads: “TO AVOID SERIOUS INJURY, DO NOT 

OPERATE MACHINE IF ANY CONTROL LEVERS OR TOGGLE SWITCHES 

CONTROLLING PLATFORM MOVEMENT DO NOT RETURN TO THE OFF 

POSITION WHEN RELEASED.” (Id. at 203, 204.) 

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RESULT IN SERIOUS INJURY OR DEATH.” (Id. at 236.) 

The purpose of these multiple cautions and daily testing requirements is to provide 

a method to alert both operators and mechanics if the DSCOS safety features are not 

functioning properly. Checking for proper operation of the safety features is not difficult. 

When high-speed functions are operational, the engine noise is noticeably higher. If high 

engine noise is present when the work platform is raised above 6 inches, the noise should 

alert the operator/mechanic of a problem. Engine noise aside, the proper operation of the 

DSCOS cut out can be confirmed by checking (daily, as the manual specifies) to see if 

high-speed functions (including high pump speed) are inoperable when the work platform 

is raised more than 6 inches. While not specifically mentioned in the warnings the proper 

operation of the safety cutout on the hydraulic jacks can be verified by raising the work 

platform more than six inches and attempting to move the jacks – if they move there is a 

problem. If safe practices are followed, an operator or mechanic would be on notice 

when safety devices were malfunctioning. 

United Rentals’ 500RTS also included a separate manual for service technicians 

and mechanics (the service manual). The service manual includes a detailed electrical 

schematic showing, among other things, the electrical communication between the 

leveling jack toggle switches and the DSCOS. A representative of United Rentals 

testified JLG informed his company in the 1990’s the leveling jack interlock was 

connected to the DSCOS and United Rentals recognized the importance of this 

information. However, the representative could not identify any way United Rentals 

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specifically passed that critical information along to its mechanics.10 Nonetheless, 

common sense dictates a mechanic would consult the service manual (and JLG) prior to 

modifying critical electrical circuitry, particularly in light of the numerous explicit “no 

alteration” warnings contained in both the operator and service manuals.

C. United Rental’s Alterations

There is no evidence the lift was incorrectly wired or otherwise defective when 

JLG sold the lift to United Rentals.11 In January 2005, United Rentals (then the owner) 

determined the lift was malfunctioning. Specifically, its high-speed functions were 

operating when the work platform was raised above 22 feet. Eric Ramos, a 

mechanic/technician employed by United Rentals, attempted to repair the malfunction. 

Ramos had never worked or been trained as an electrician and was never instructed on 

how to make electrical repairs to the lift. According to his testimony, when he opened 

the platform control console, he did not believe the wiring looked like the wiring diagram 

provided in the service manual. During 19 hours of work on the lift’s wiring system, he 

tried to reconstruct the wiring as he saw it on the JLG diagram but did not recall exactly 

what he did. In fact, Ramos made significant alterations to the lift’s wiring system which 

substantially differed from the wiring diagram in JLG’s manual. 

Relying on expert testimony, the district court described Ramos’s alterations: 

[T]he wiring in the ground terminal was cut and spliced to make Terminal 

 10 Appellants emphasized this testimony in their claims against United Rentals but 

minimize it now. 

11 The date JLG sold the lift to United Rentals is not identified in the record. 

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No. 24 “hot” or energized any time the ignition was on. Then a pin was 

added to the platform control box at Location W, and a brown wire with 

blue markings was added to connect this modified pin with the nowenergized Terminal No. 24. Finally, the wiring inside the platform control 

box was modified so as to connect the newly spliced pin at Location W 

with the toggle switches that controlled the leveling jacks. 

The inspection of the scissor lift involved in the accident also revealed 

other anomalous modifications. For example, the cable connectors running 

from the ground terminal also were altered so as to have two female 

connectors attached to two male connectors at the platform control box, 

rather than one male and one female as originally designed. In addition, a 

green light on the platform control box that is designed to switch on when 

the leveling jacks are set was disconnected. 

(Appellants’ Appx. at 391-392 (record citations omitted).) 

Ramos’s rewiring made the high-speed functions of the lift’s engine cut out when 

the work platform was raised above 6 inches. But, critical to the issue here, his rewiring 

also inadvertently disabled the cut out switch connection between the leveling jack toggle 

switches and the DSCOS. He created a new power source for the leveling jack toggle 

switches which continued to provide power to the jacks even when the work platform 

was raised above 6 inches. His alterations allowed the switches to extend and retract the 

leveling jacks regardless of the work platform’s elevation. They had other unfortunate 

consequences; his alterations compromised the warnings contained on the equipment and 

in the operator and service manuals. Normally the cut out of high-speed functions when 

the work platform was raised over 6 inches would result in lower engine noise. Lower 

noise would also indicate the DSCOS had cut power to the leveling jack toggle switches. 

Wiring around the connection between the DSCOS and the leveling jack switches 

eliminated this audible warning. Nevertheless, the daily checks would reveal the 

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problem, particularly those requiring the operator to “CHECK ALL FUNCTIONS . . . 

TO BE SURE THERE ARE NO MALFUNCTIONS” and the operator’s manual telling 

users to perform “[a] functional check of all systems” and warning, “TO AVOID 

INJURY DO NOT OPERATE A MACHINE UNTIL ALL MALFUNCTIONS HAVE 

BEEN CORRECTED . . .” (Id. at 236, 75 (emphasis added).) Because Ramos 

mistakenly believed “everything [was] functioning the way it should be . . . above [a] 

height of 22 feet,” the lift was placed back into service.12 (Id. at 154.) 

More than a year later, on February 20, 2006, Ramos performed an inspection of 

the lift. His inspection reported the lift was working properly and had not been modified 

without authorization. 13 United Rentals rented the lift to Yearout Mechanical on March 

1, 2006. See United Rentals Nw., Inc. v. Yearout Mech., Inc., 573 F.3d 997, 999 (10th 

Cir. 2009). On April 1, 2006, Camerino Ramirez and Anthony and James Magoffe were 

using the lift to install ductwork in an airport hangar approximately fifty feet above the 

ground. While lowering the work platform, but still approximately 46 feet above the 

ground, the right rear stabilizing jack retracted and the lift tipped over, injuring James and 

killing Anthony and Camerino. 

III. PROCEDURAL BACKGROUND 

While Appellant’s complaint originally contained a number of claims against JLG, 

 12 Ramos’s deposition testimony indicates he understood there was a connection 

between the leveling jack switches and the lift’s high speed functions, but his 

assumptions regarding the details of this connection were incorrect.

13 Apparently his inspection did not include raising the work platform above six 

inches and attempting to move the hydraulic jacks. Doing so would have revealed the 

safety problems created by his earlier rewiring. 

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at oral argument they acknowledged the only remaining claims contend JLG is strictly 

liable and/or negligent because of its failure to warn about the danger of an unexpected 

retraction of a leveling jack. Appellants say Ramos’s faulty rewiring of the electronics, 

the subsequent retraction of the leveling jack, and the collapse of the lift, were direct 

results of JLG’s failure to specifically explain the multiple functions of the DSCOS – that 

it not only controlled the high-speed functions but also disabled the leveling jack toggle 

switches when the work platform was raised more than six inches. They also argue JLG 

should have reasonably foreseen the possibility of Ramos’s unauthorized and improper 

modifications and warned potential operators of the danger such acts might present. 

Appellants filed a motion for partial summary judgment seeking judgment against 

JLG for breach of the “duty to warn and provide directions for use to avoid injury or 

death resulting from the unexpected retraction” of the scissor lift’s leveling jacks during 

operation. (Appellants’ Opening Br. at 10.) JLG opposed the motion on procedural and 

substantive grounds. 

JLG filed several motions to exclude some of Appellants’ testimonial evidence.14 

Of concern here is a motion to exclude portions of James Magoffe’s affidavit. Had he 

been properly warned of the interrelationship between the DSCOS and the leveling jack 

toggle switches, it asserted, before using the lift he would have tested the leveling jacks 

 14 These motions included: (1) JLG’s Motion to Exclude Opinions of Charles 

Proctor; (2) JLG’s Motion to Exclude Opinions of Vincent Gallagher; (3) JLG’s Motion 

to Strike Affidavit of Vincent Gallagher; (4) JLG’s Motion to Strike Affidavit of Charles 

Proctor; and (5) JLG’s Motion to Strike Affidavit of James Magoffe. The district court 

granted the motions. Appellants did not appeal from the decisions with respect to Proctor 

and Gallagher.

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with the work platform raised above its stored position. JLG argued his statements were 

improper under the Federal Rules of Evidence because they were speculative and not 

rationally based on his perception. Appellants claimed the testimony was admissible 

because James Magoffe was a safety-conscious construction supervisor and his opinion 

(about what he would have done in response to a proper warning) was rationally based on 

his perception, helpful to a determination of whether a better warning would have made a 

difference, and not based upon scientific, technical or other specialized knowledge. 

JLG also moved for summary judgment on all claims, alleging the substantial 

post-sale modifications to the lift were unforeseeable, thus relieving it of liability under 

both negligence and strict liability theories. Appellants opposed the motion, raising 

arguments based on causation and contribution under New Mexico law. 

The district court granted JLG’s motion to strike James Magoffe’s contested 

statements. It also granted JLG’s motion for summary judgment holding, as a matter of 

law, the unauthorized and improper bypass of the leveling jack cut out by a novice 

repairman was unforeseeable thus imposing no duty on JLG to warn of such a possibility. 

It said: 

[New Mexico’s] courts usually leave questions about the foreseeability of 

unintended post-sale misuse of a product for the jury to decide at trial. On 

the other hand, there are cases where the post-sale use or modification of a 

product is so unforeseeable that the matter can be taken from the jury. In 

retrospect, almost nothing is entirely unforeseeable. A test of 

foreseeability, however, does not bring within the scope of a defendant’s 

liability every injury that might possibly occur. Foreseeability has been 

defined as that which is objectively reasonable to expect, not merely what 

might conceivably occur. This requirement of objective reasonableness 

provides a basis for the Court to conclude, as a matter of law, that certain 

risks entailed by post-sale modifications are too unforeseeable to establish a 

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defect or unreasonable risk of injury in the product itself or in the existing 

warnings and directions that accompany it at the time of sale. 

(Id. at 386 (quotations and citations omitted).) It also denied Appellants’ motion for 

partial summary judgment, concluding the motion did “not provide an appropriate vehicle 

for partial adjudication of the duty and breach elements of [Appellants’] failure-to-warn 

claims.” (Id. at 437.) Appellants appeal from both decisions. As a collateral matter, they 

also request we certify questions of New Mexico law to the New Mexico Supreme Court. 

We deny the certification request15 and affirm.

IV. DISCUSSION 

In diversity cases like this, the substantive law of the forum state governs the 

analysis of the underlying claims, “but we are governed by federal law in determining the 

propriety of the district court’s grant of summary judgment.” Eck v. Parke, Davis & Co.,

256 F.3d 1013, 1016 (10th Cir. 2001). Accordingly, “[w]e review the grant of summary 

judgment de novo, applying the same standard as the district court pursuant to Rule 56(c) 

of the Federal Rules of Civil Procedure.” Gwinn v. Awmiller, 354 F.3d 1211, 1215 (10th 

 15 The New Mexico Rules of Appellate Procedure permit the New Mexico 

Supreme Court to accept a certification request from any federal court. See NMRA, Rule 

12-607(A)(1) (2009) (“The Supreme Court may answer . . . questions of law certified to it 

by a court of the United States . . . .”); compare California Rules of Court, Rule 8.548(a) 

(permitting the California Supreme Court to only consider a certification request from the 

United States Supreme Court, a United States Court of Appeals, or the court of last resort 

from any state, territory or commonwealth). Appellants made no certification request in 

the district court. “We generally will not certify questions to a state supreme court when 

the requesting party seeks certification only after having received an adverse decision 

from the district court.” In re Midpoint Dev., L.L.C., 466 F.3d 1201, 1207 (10th Cir. 

2006) (quotations omitted). This case offers no reason to depart from our customary 

practice. 

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Cir. 2004). We also review de novo the district court’s interpretation of substantive state 

law. Enfield ex rel. Enfield v. A.B. Chance Co., 228 F.3d 1245, 1247 (10th Cir. 2000). 

Summary judgment is appropriate “if the pleadings, the discovery and disclosure 

materials on file, and any affidavits show that there is no genuine issue as to any material 

fact and that the movant is entitled to judgment as a matter of law.” Fed. R. Civ. P. 

56(c)(2).16 “While the movant bears the burden of showing the absence of a genuine 

issue of material fact, the movant need not negate the nonmovant’s claim.” Jenkins v. 

Wood, 81 F.3d 988, 990 (10th Cir. 1996). Once the movant carries this burden, the 

nonmoving party must “bring forward specific facts showing a genuine issue for trial as 

to those dispositive matters for which it carries the burden of proof.” Id. An issue of 

material fact is genuine if a reasonable jury could find in favor of the nonmovant. Id. 

While our summary judgment standard requires us to consider the evidence in the light 

most favorable to the nonmoving party, it does not require us to disregard undisputed 

evidence favoring the moving party. Zamora v. Elite Logistics, Inc., 478 F.3d 1160, 1168 

(10th Cir. 2007). 

A. Reasonable Foreseeability Under New Mexico’s Law

In New Mexico, “a manufacturer or seller of a product may be held [strictly] liable 

after a substantial modification of the product if the modification was reasonably 

foreseeable.” Chairez v. James Hamilton Constr. Co., 215 P.3d 732, 737 (N.M. Ct. App. 

 16 The district court applied the proper rule although it used insignificantly 

different language. Rule 56 has been slightly altered effective December 1, 2009. The 

modifications are irrelevant to our discussion. 

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2009) (citing Webb v. Rodgers Mach. Mfg. Co., 750 F.2d 368, 372 (5th Cir. 1985) (under 

Texas law, “a manufacturer may be held liable where the subsequent alteration leading to 

the accident was foreseeable by the manufacturer”); Smith v. Verson Allsteel Press Co., 

393 N.E.2d 598, 604 (Ill. App. Ct. 1979) (if a foreseeable modification to a machine 

contributes to the plaintiff’s injury, the manufacturer may still be liable); Eck v. 

Powermatic Houdaille, Div. of Houdaille Indus., Inc., 527 A.2d 1012, 1018 (Pa. Super. 

Ct. 1987) (“[T]he concept of ‘foreseeability’ is a significant factor in determining 

whether a manufacturer or seller will be held responsible for injuries resulting after postsale modifications of a product have been made.”); Zacher v. Budd Co., 396 N.W.2d 122, 

134 (S.D. 1986) (“The overriding consideration . . . concerning both the alleged 

substantial changes or alterations . . . [is] the doctrine of foreseeability.”). “Each case 

must be considered on its own merits” to determine whether modifications were 

objectively and reasonably foreseeable. Chairez, 215 P.3d at 740. If “reasonable minds 

can differ on this issue, it is for the jury to determine these factual questions concerning 

the nature of the modifications, their relationship to each other, causation, and 

foreseeability.” Id. at 738. The New Mexico courts have refused to set forth a blanket 

rule that summary judgment will never be appropriate in a modification context. Id. at 

740 (refusing to express “a blanket rule that summary judgment will never be appropriate 

in this context”). Courts may decide “as a matter of law [whether] the use to which the 

product was put was so unintended and unforeseeable that the case [may be decided on 

summary judgment].” Van de Valde v. Volvo of Am. Corp., 744 P.2d 930, 931 (N.M. Ct. 

App. 1987). 

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Similarly, a claim of negligence under New Mexico law also “encompasses the 

concepts of foreseeability of harm to the person injured and of a duty of care toward that 

person.” Herrera v. Quality Pontiac, 73 P.3d 181, 186 (N.M. 2003) (quotations omitted). 

A “supplier must use ordinary care to warn of a risk of injury. However, there is no duty 

to warn of a risk unknown to the supplier, unless . . . the supplier should have known of 

the risk.” N.M. Civ. UJI 13-1415. “Where an injury is caused by a risk or a misuse of 

the product which was not reasonably foreseeable to the manufacturer and supplier, they 

are not liable.” Smith ex rel. Smith v. Bryco Arms, 33 P.3d 638, 645 (N.M. Ct. App. 

2001). 

B. Foreseeability -- United’s Modifications to the Lift

JLG designed, manufactured and sold a scissor lift with an interlock device to 

prevent the leveling jacks from moving, once they were set, if the work platform was 

raised more than six inches. In addition, it cautioned, in numerous places and ways, not 

to modify the lift without its prior approval and specifically warned that any such 

modification might result in serious injury or death. Thus, as the district court put it, the 

question is “whether it was reasonably foreseeable to . . . JLG that someone would 

disobey the manufacturer’s directions, extensively modify the scissor lift without its 

knowledge or consent so as to bypass the interlock device, and then use the lift in such a 

modified condition without any warning that the equipment had been modified.” 

(Appellants’ Appx. at 391.) The district court concluded: “The undisputed facts 

concerning the extent of the post-sale modifications to the scissor lift and the disregard of 

existing warnings and directions supplied by . . . JLG support the inference that the risks 

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entailed by these post-sale modifications were not reasonably foreseeable to . . . JLG as a 

matter of law.” (Id. at 393.) 

Appellants dedicate the majority of their brief to arguments addressing the 

nuances of New Mexico law on the issues of causation, contribution, comparative fault 

and intervening cause. While these issues are important, so is context - their applicability 

depends on foreseeability. For example, the district court referenced New Mexico’s Civil 

Uniform Jury Instruction 13-1424 which states: 

The cause of an injury is that which, in a natural and continuous sequence 

[unbroken by any independent intervening cause], contributes to bringing 

about the injury and without which the injury would not have occurred. [It 

need not be the only cause, nor the last nor nearest cause. It is sufficient if 

it occurs with some other cause, acting at the same time, which, in 

combination with it, causes the injury.] 

[“Independent intervening cause” is that which interrupts the natural 

sequence of events which could reasonably be expected to result from the 

condition in which a product was sold or from a foreseeable manner of use. 

An independent intervening cause unforeseeably turns aside the course of 

events and produces a result which could not reasonably have been 

expected.] 

(Emphasis added). The court’s discussion related solely to the concept of foreseeability 

as a necessary element of liability and the lack of foreseeability as the lynchpin of its 

decision.17

 17 The district court also addressed New Mexico’s Civil Uniform Jury Instruction 

13-1402, which requires suppliers to avoid foreseeable risks of injuries to users of its 

products, and Civil Uniform Jury Instruction 13-1425, which requires adequate warnings 

to reasonably foreseeable users disclosing the nature and extent of a danger not covered 

by a general warning or simple directive to use or not to use the product in a certain way. 

It also considered the Restatement (Third) of Torts and a number of cases which all 

discuss manufacturer liability for foreseeable uses and foreseeable injuries. 

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According to Appellants, JLG should have foreseen that “Ramos [would] believe[] 

he was restoring the 500RTS to its original condition [because] he tried to match the 

wiring in JLG’s schematic18 . . . [and he would] not view this repair as an alteration or 

modification of the machine, and would not have considered written consent from JLG to 

be required.” (Appellants’ Opening Br. at 28-29.) And, thus, it should have warned 

about such a possibility. “A test of foreseeability, however, does not bring within the 

scope of a defendant’s liability every injury that might possibly occur.” Van de Valde, 

744 P.2d at 932 (quotations omitted). The New Mexico Supreme Court has defined 

foreseeability “as that which is objectively reasonable to expect, not merely what might 

conceivably occur.” Id. (quotations omitted). 

As the district court noted, there was no evidence other owners or users had made 

substantial modifications to the DSCOS, particularly without contacting JLG. Certainly 

no rational trier of fact could reasonably conclude JLG should foresee a mechanic might 

create new power sources; cut, splice, add and reconnect wires to new pins and 

connectors; and disconnect a light designed to illuminate when the leveling jacks were set 

yet still believe such acts would not amount to a modification or alteration to the lift.19 

Indeed, there was no evidence suggesting JLG had any reason to contemplate Ramos’s 

 18 The wiring schematic showed the connection between the DSCOS and the 

leveling jack switches. 

19 Appellants conceded at oral argument that the bypass caused by Ramos’s 

rewiring was the sole cause of the leveling jack retraction. They admitted that without 

Ramos’s modifications, the interlock device would have prevented the leveling jack 

retraction, and thus the injuries sustained when the lift tipped over. 

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improvident undertakings would even be attempted. Thus, JLG could not reasonably 

foresee why additional warnings were needed. 

Appellants stressed at oral argument “all kinds of things” could have stopped the 

DSCOS from operating properly, including “debris . . . [or] low temperatures.” (Oral 

Argument Recording at 30:44-30:50.) Such possibilities, they assert, created an 

unreasonable risk of injury for which an adequate warning should have been given. 

While it may be plausible that ice or debris would interfere with the DSCOS, those are 

not the facts presented in this case. The foreseeability of other possible causes must wait. 

See Kunkel v. Cont’l Cas. Co., 866 F.2d 1269, 1274 (10th Cir. 1989) (“‘Advance 

expressions of legal judgment upon issues which remain unfocused’ are impermissible.”) 

(quoting United States v. Fruehauf, 365 U.S. 146, 157 (1961)). 

Under the facts presented here, it was unforeseeable that unreported modifications 

would bypass the interlock to the leveling jacks and remove that integrated safety 

mechanism which otherwise alerted users (by cutting out the high-speed functions and 

their attending noise) the lift was unsafe to operate. The modifications caused the lift to 

function in a way unintended and unexpected by JLG. The malfunction of the leveling 

jack cut out switch was unforeseeable as a matter of law and, therefore, JLG had no 

reason to require or recommend more comprehensive operational tests to disclose such a 

possibility. Accordingly, we affirm the district court’s grant of summary judgment in 

favor of JLG on all claims. 

C. Remaining Issues

Given our conclusion that JLG is not liable under either strict liability or 

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negligence theories, Appellants’ motion for partial summary judgment must fail. In 

addition, Magoffe’s affidavit, even if admissible would not change the result as JLG had 

no duty to provide additional warnings. In any event, his statement that a hypothetical 

warning would have prevented the accident is inadmissible. Because Magoffe is not an 

expert witness, his statements must be rationally based on his perceptions and helpful to 

the determination of a material fact. Fed. R. Evid. 701. “The perception requirement 

stems from [Rule 602 of the Federal Rules of Evidence] which requires a lay witness to 

have first-hand knowledge of the events he is testifying about so as to present only the 

most accurate information to the finder of fact.” Grace United Methodist Church v. City 

of Cheyenne, 451 F.3d 643, 667 n.12 (10th Cir. 2006) (quotations omitted); see also 

Gossett v. Okla. ex. rel. Bd. of Regents for Langston Univ., 245 F.3d 1172, 1179 (10th 

Cir. 2001) (holding an affidavit of a lay witness, an instructor at the university, 

admissible in a gender discrimination case because she “observe[d] firsthand for several 

years the School’s policies and practices with respect to its treatment of male students. 

Her opinion . . . convey[ed] her impression based on what she had herself perceived.”). 

Magoffe’s speculation as to what he would have done is not based on his first-hand 

perception of actual events. 

AFFIRMED. Appellants’ motion to certify questions to the New Mexico 

Supreme Court is DENIED. 

Entered by the Court: 

Terrence L. O’Brien 

United States Circuit Judge 

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